Quantum 00220201 User Manual

DLT VS160 SCSI Interface Guide

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Revision History

All revisions made to this document are listed below in chronological order.

Document Release Date Summary of Chan ges

DLT VS160 SCSI Interface Guide

A02 December 29,

2003

Initial release by Qua n tu m Co r po r at io n.

iii

DLT VS160 SCSI Interface Guide

Introduction 002202-01

1Intro du c t io n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Purpose and Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Structure of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Conventions Used in This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

SCSI Command Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

2General SC S I Bu s Operat io n . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

Data Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 1

Initiator/Target Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -1

SCSI IDs and Logical Unit Numbers (LUNs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Unit Attention Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Behavior Around Power -on and SCSI Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Data Cache and Tape Write Interaction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Other SCSI Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Bus Phases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

ATTENTION Signal Response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

STATUS Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

BUS FREE Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Bus Parity Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

3SCS I M essages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

SCSI Message System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Supported SCSI Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Extended Messages (01h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

T wo-Byte Messages (2xh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

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ABORT Message (06h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

BUS DEVICE RESET Message (0Ch). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

COMMAND COMPLETE Message (00h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

DISCONNECT Message (04h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

IDENTIFY Message (80h–FFh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

IGNORE WIDE RESIDUE Message (23h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

INITIATOR DETECTED ERROR Message (05h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

LINKED COMMAND COMPLETE Message (0Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

LINKED COMMAND COMPLETE WITH FLAG Message (0Bh). . . . . . . . . . . . . . . . . . . . 3- 15

MESSAGE PARITY ERROR Message (09h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

MESSAGE REJECT Message (07h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

NO OPERATION Message (08h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

PARALLEL PROTOCOL REQUEST (Extended Message 04h). . . . . . . . . . . . . . . . . . . . . . . 3-19

RESTORE POINTERS Message (03h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

SAVE DATA POINTER Message (02h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23

SYNCHRONOUS DATA TRANSFER REQUEST (Extended Message 01h) . . . . . . . . . . . . 3-24

WIDE DATA TRANSFER REQUEST (Ex tended Mes s age 03h) . . . . . . . . . . . . . . . . . . . . . . 3-25

4SCS I C o mmands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Control Byte — Flag and Link Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Summary of Supported Sequential- access Device Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

ERASE Command (19h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 -4

INQUIRY Command (12h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Standard INQUIRY Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Vendor Unique Bytes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Vital Product Data Pages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Supported Vital Product Dat a Page (00h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Unit Serial Number Page (80h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

Device Identification Page (83h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Firmware Build Information Page (C0h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

Subsystem Components Revision Page (C1h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18

Command Support Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18

LOAD/UNLOAD Command (1Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

LOCATE Command (2Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 3

LOG SELECT Command (4Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25

Error Detection Summary in LOG SELECT CDB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27

Operation of LOG SELECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27

LOG SELECT Page Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28

Error Detection Summary in LOG SELECT Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31

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DLT VS160 SCSI Interface Guide Table of Contents

LOG SENSE Command (4Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32

Error Detection Summary in LOG SENSE CDB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34

Supported Pages LOG SENSE Page (00h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-35

Read / Write Error LOG SENSE Page (Pages 02h and 03h) . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36

Last n Error Events LOG SENSE Page (07h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39

TapeAlert LOG SENSE Page (2Eh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42

Read/Write Compression Ratio LOG SENSE Page (32h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46

Parameter Value: Codes 0000h and 0001h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-48

Parameter Value: Codes 0002h through 0009h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-49

Device Wellness LOG SENSE Page (33h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-51

Device Status LOG SENSE Page (3Eh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-54

MODE SELECT (6) / (10) Command (15h / 55h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-57

MODE SELECT Pages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-59

MODE SELECT Parameter List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-59

Read / Write Error Recovery Page (01h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-64

Disconnect/Reconnect Page (02h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-65

Control Mode Page (0Ah). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-67

Data Compression Page (0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-69

Device Configuration Page (10h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-71

Medium Partition Page (11h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-73

TapeAlert Page (1Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-74

EEPROM Vendor Unique Page (3Eh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-78

Changeable Parameters Within MODE SELECT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-81

MODE SENSE (6) / (10) Command (1Ah / 5Ah). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-82

MODE SENSE Parameter List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-84

MODE SENSE Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-88

Read / Write Error Recovery Page (01h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-89

Disconnect / Reconnect Page (02h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-90

Control Mode Page (0Ah). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-92

Data Compression Page (0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-94

Device Configuration Page (10h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-96

Medium Partition Page (11h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-98

TapeAlert Page (1Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-99

EEPROM Vendor Unique Page (3Eh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-101

PERSISTENT RESERVE IN Command (5Eh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-103

Read Keys Service Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-104

Read Reservation Service Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-106

SCSI Commands Under Reservations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-110

PERSISTENT RESERVE OUT Command (5Fh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-111

PERSISTENT RESERVE OUT Command Service Actions . . . . . . . . . . . . . . . . . . . . . . . . . 4-115

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PERSISTENT RESERVE OUT Command Descriptor Block Behavior . . . . . . . . . . . . . . . . 4-121

PERSISTENT RESERVE OUT Parameter List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-121

PERSISTENT RESERVE OUT Parameter List Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-123

SCSI Commands Under Reservations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-124

PREVENT / ALLOW MEDIUM REMOVAL Command (1Eh) . . . . . . . . . . . . . . . . . . . . . . . . . 4-125

READ Command (08h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-126

Filemark and End-of-Data Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-127

End of Medium/Partition Handl ing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-128

READ BLOCK LIMITS Command (05h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-129

READ BUFFER Command (3Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-131

Combined Header and Data Mode (0000b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-132

Data Mode (0010b). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-133

Descriptor Mode (0011b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-133

Echo Buffer Mode (1010b). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-134

Echo Buffer Descriptor Mode (1011b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-135

READ POSITION Command (34h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-136

READ POSITION Data — Short Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-137

READ POSITION Data — Long Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4- 139

RECEIVE DIAGNOSTIC RESULTS Command (1Ch). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-141

Diagnostics Result s Returned . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-142

RELEASE (6) Command (17h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-143

Medium Changer Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-144

SCSI Commands Under Reservations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-144

RELEASE (10) Command (57h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-145

SCSI Commands Under Reservations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-146

REPORT DENSITY SUPPORT Command (44h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-147

Density Support Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-148

Density Support Data Block Descr iptor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-149

REPORT DEVICE IDENTIFIER Command (A3h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-152

REPORT DEVICE IDENTIFIER Command Parameter List. . . . . . . . . . . . . . . . . . . . . . . . . 4-153

REPORT LUNS Command (A0h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-154

REPORT LUNS Command Parameter List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-155

REQUEST SENSE Command (03h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4- 156

REQUEST SENSE Information Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-157

RESERVE (6) Command (16h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-164

Medium Changer Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-165

SCSI Commands Under Reservations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-166

RESERVE (10) Command (56h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-167

SCSI Commands Under Reservations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-169

REWIND Command (01h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-170

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SEND DIAGNOSTIC Command (1Dh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-171

Unit Resident Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-171

SET DEVICE IDENTIFIER Command (A4h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-173

SET DEVICE IDENTIFIER Command Parameter List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-174

SPACE Command (11h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-175

TEST UNIT READY Command (00h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-177

WRITE Command (0Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-178

Exception Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-179

WRITE BUFFER Command (3Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-180

Header and Data Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-181

Write Data Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18 1

Download Microcode Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-182

Download Microcode and Save Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-182

Echo Buffer Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-182

WRITE FILEMARKS Command (10h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-183

5Medium Chang e r De v ice Comm ands . . . . . . . . . . . . . . . . . . . . 5-1

INITIALIZE ELEMENT STATUS Command (07h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

INQUIRY Command (12h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

LOG SENSE Command (4Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

LOG SENSE Pages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Supported Pages LOG SENSE Page (Page 00h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Last n Error Events LOG SENSE Page (07h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

TapeAlert LOG SENSE Page (2Eh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Device Wellness LOG SENSE Page (33h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

MODE SELECT Command (15h/55h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

MODE SELECT Pages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

MODE SELECT Parameter List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

TapeAlert Page (1Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Element Address Assignment Page (1Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Device Capabilities Page (1Fh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

MODE SELECT Changeable Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

MODE SENSE Command (1Ah/5Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

MODE SENSE Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

MODE SENSE Parameter List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

TapeAlert Page (1Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

Element Address Assignment Page (1Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14

Medium Changer Element Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15

Device Capabilities Page (1Fh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17

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T able of Contents DLT VS160 SCSI Interface Guide

MOVE MEDIUM Command (A5h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18

READ ELEMENT STATUS Command (B8h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20

Element Status Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 -21

Element Status Data Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22

Element Status Page Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23

Storage Element Descriptor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24

Data Transfer Descriptor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26

ASCSI Commands U n der Reserv a tion . . . . . . . . . . . . . . . . . . . . .A-1

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Introduction 002202-01

List of Tables

1Intro du c t io n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

T able 1-1. Typographical Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

T able 1-2. SCSI Command Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

2General SC S I Bu s Operat io n . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

3SCS I M essages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

T able 3-1. Supported SCSI Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Table 3-2. Partial Extended Message — Message Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Table 3-3. Partial Two-byte Message — Message Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

T able 3-4. ABORT (06h) — Message Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Table 3-5. BUS DEVICE RESET (0Ch) — Message Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

T able 3-6. COMMAND COMPLETE (00h) — Message Behavior . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Table 3-7. DISCONNECT (04h) — Message Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

T able 3-8. IDENTIFY (80h–FFh) — Field Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Table 3-9. IDENTIFY (With Another LUN) — Message Behavior . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Table 3-10. IDENTIFY (Invalid) — Message Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Table 3-11. IDENTIFY (Valid) — Message Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

T able 3-12. IGNORE WIDE RESIDUE (23h) — Message Behavior . . . . . . . . . . . . . . . . . . . . . . 3-12

T able 3-13. INITIATOR DETECTED ERROR (05h) — Message Behavior. . . . . . . . . . . . . . . . . 3-13

T able 3-14. LINKED COMMAND COMPLETE (0Ah) — Message Behavior . . . . . . . . . . . . . . 3-14

T able 3-15. LINKED COMMAND COMPLETE WITH FLAG (0Bh) — Message Behavior . . . 3-15

T able 3-16. MESSAGE PARITY ERROR (09h) — Message Behavior. . . . . . . . . . . . . . . . . . . . . 3-16

Table 3-17. MESSAGE REJECT (07h) — Message Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Table 3-18. NO OPERATION (08h) — Message Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

T able 3-19. Features of the PARALLEL PROTOCOL REQUEST Message . . . . . . . . . . . . . . . . . 3-20

T able 3-20. PARALLEL PROTOCOL REQUEST (Ext. Message 04h) — Message Behavior. . . 3- 20

Table 3-21. RESTORE POINTERS (03h) — Message Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

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List of Tables DLT VS160 SCSI Interface Guide

T able 3-22. SAVE DATA POINTER (02h) — Message Behavior . . . . . . . . . . . . . . . . . . . . . . . . . 3-23

T able 3-23. SYNCHRONOUS DATA TRANSFER REQUEST (Ext. Message 01h) — Message

Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24

T able 3-24. WIDE DATA TRANSFER REQUEST (Ext. Message 03h) — Message Behavior . . 3-26

4SCS I C o mmands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

T able 4-1. Supported SCSI Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

T able 4-2. ERASE (19h) Command Descriptor Block — Field Descriptions . . . . . . . . . . . . . . . . . 4-4

T able 4-3. INQUIRY (12h) Command Descriptor Block — Field Descriptions . . . . . . . . . . . . . . . 4-5

Table 4-4. INQUIRY (12h) Standard Data Page — Field Descriptions . . . . . . . . . . . . . . . . . . . . . . 4-8

T able 4-5. INQUIRY (12h) Vendor Unique Data Page — Field Descriptions . . . . . . . . . . . . . . . . 4-11

Table 4-6. INQUIRY (12h) Unit Serial Number Page — Field Descriptions. . . . . . . . . . . . . . . . . 4-13

T able 4-7. INQUIRY (12h) Device Identification Page — Field Descriptions. . . . . . . . . . . . . . . . 4-14

Table 4-8. Identifier Descriptors — Field Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

T able 4-9. Device Identification — Supported Identifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

T able 4-10. INQUIRY (12h) Firmware Build Information Page — Field Descriptions. . . . . . . . . 4-17

T able 4-11. INQUIRY (12h) Command Support Data Page — Field Descriptions . . . . . . . . . . . . 4-19

T able 4-12. LOAD/UNLOAD (1Bh) Command Descriptor Block — Field Descriptions. . . . . . . 4- 22

T able 4-13. LOCATE (2Bh) Command Descriptor Block — Field Descriptions. . . . . . . . . . . . . . 4-24

T able 4-14. LOG SELECT (4Ch) Command Descriptor Block — Field Descriptions . . . . . . . . . 4-25

T able 4-15. LOG SELECT (4Ch) DATA-OUT Phase Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27

T able 4-16. LOG SELECT Log Page Header — Field Descriptions . . . . . . . . . . . . . . . . . . . . . . . 4-28

T able 4-17. LOG SELECT Log Parameters — Field Descriptions . . . . . . . . . . . . . . . . . . . . . . . . 4-30

Table 4-18. LOG SENSE Log Parameters — Field Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32

T able 4-19. Read/Write Error LOG SENSE Page Header — Field Descriptions. . . . . . . . . . . . . . 4-36

T able 4-20. Read/Write Error LOG SENSE Page Parameters — Field Descriptions. . . . . . . . . . . 4-37

T able 4-21. Last n Error Events LOG SENSE Page Header — Field Descriptions . . . . . . . . . . . . 4-39

T able 4-22. Log Parameters for Last n Error Events LOG SENSE Page — Field Descriptio ns . . 4-40

Table 4-23. TapeAlert LOG SENSE Page Header — Field Descriptions. . . . . . . . . . . . . . . . . . . . 4-42

Table 4-24. TapeAlert LOG SENSE Page Parameters — Field Descriptions. . . . . . . . . . . . . . . . . 4-43

T able 4-25. Read/Write Compression Ratio LOG SENSE Page Header — Field Descriptions. . . 4-46

Table 4-26. Read/Write Compression Ratio LOG SENSE Page — Field Descriptions . . . . . . . . . 4-47

T able 4-27. Log Parameters for Read/Write Bytes Transferred LOG SENSE Page — Field

Descr ip t i on s (Paramet er Co d es 02h thr o u gh 0 9 h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-49

T able 4-28. Device Wellness LOG SENSE Page Header — Field Descriptions . . . . . . . . . . . . . . 4-51

T able 4-29. Device Wellness LOG SENSE Page Parameters — Field Descriptions . . . . . . . . . . . 4-53

T able 4-30. Device Status LOG SENSE Page Header — Field Descriptions. . . . . . . . . . . . . . . . . 4-54

T able 4-31. Device Status LOG SENSE Page Parameters — Field Descriptions. . . . . . . . . . . . . . 4-55

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DLT VS160 SCSI Interface Guide List of Tables

T able 4-32. Parameter Values for Device Status LOG SENSE Page (Cleaning Rela ted) — Field

Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56

T able 4-33. MODE SELECT (15h / 55h) Command Descriptor Block — Field Descriptions . . . 4-58

T able 4-34. MODE SELECT Mode Parameter List — Field Descriptions . . . . . . . . . . . . . . . . . . 4-62

Table 4-35. Read/Write Error Recovery MODE SELECT Page — Field Descriptions . . . . . . . . . 4-64

T able 4-36. Disconnect/Reconnect MODE SELECT Page — Field Descript ions. . . . . . . . . . . . . 4-66

T able 4-37. Control Mode MODE SELECT Page — Field Descriptions. . . . . . . . . . . . . . . . . . . . 4-68

T able 4-38. Data Compression MODE SELECT Page — Field Descriptions . . . . . . . . . . . . . . . . 4-69

T able 4-39. Device Configuration MODE SELECT Page — Field Descriptions. . . . . . . . . . . . . . 4-71

T able 4-40. Medium Partition MODE SELECT Page — Field Descriptions. . . . . . . . . . . . . . . . . 4-73

Table 4-41. TapeAlert MODE SELECT Page — Field Descriptions . . . . . . . . . . . . . . . . . . . . . . . 4-74

T able 4-42. EEPROM Vendor Unique MODE SELECT Page — Parameter Descript ions . . . . . . 4-78

T able 4-43. Changeable Parameters Within MODE SELECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-81

T able 4-44. MODE SENSE (1Ah/5Ah) Command Descriptor Block — Field Descriptions. . . . . 4-83

T able 4-45. MODE SENSE (6/10) Command Header — Field Descriptions. . . . . . . . . . . . . . . . . 4-86

T able 4-46. MODE SENSE (6/10) Block Descriptor — Field Descriptions . . . . . . . . . . . . . . . . . 4-87

T able 4-47. Supported MODE SENSE Block Pages and Page Codes . . . . . . . . . . . . . . . . . . . . . . 4-88

Table 4-48. Read/Write Error Recovery MODE SENSE Page — Field Descriptions . . . . . . . . . . 4-89

T able 4-49. Disconnect / Reconnect MODE SENSE Page — Field Descriptions . . . . . . . . . . . . . 4-91

Table 4-50 . Control Mode MODE SENSE Page — Fiel d D escriptio n s. . . . . . . . . . . . . . . . . . . . . 4-92

Table 4-51. Data Compression MODE SENSE Page — Field Descriptions . . . . . . . . . . . . . . . . . 4-94

T able 4-52. Device Configuration MODE SENSE Page — Field Descriptions. . . . . . . . . . . . . . . 4-96

T able 4-53. Medium Partition MODE SENSE Page — Field Descriptions . . . . . . . . . . . . . . . . . . 4-98

Table 4-54. TapeAlert MODE SENSE Page — Field Descriptions . . . . . . . . . . . . . . . . . . . . . . . . 4-99

T able 4-55. PERSISTENT RESERVE IN (5Eh) Command — Field Descriptions . . . . . . . . . . . 4-103

T able 4-56. PERSISTENT RESERVE IN Read Keys Parameter List — Field Descriptions. . . . 4-105

T able 4-57. PERSISTENT RESERVE IN Read Reservations Parameter List — Field

Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-107

Table 4-58. PERSISTENT RESERVE IN Read Reservations Descriptor — Field Descriptions . 4-108

Table 4-59. PERSISTENT RESERVE OUT (5Fh) Command — Field Descriptions . . . . . . . . . 4-112

Table 4-60. PERSISTENT RESERVE OUT Command — Service Action Descriptions . . . . . . 4-115

Table 4-61. Command Descriptor Block Field Relevance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-121

T able 4-62. PERSISTENT RESERVE OUT Parameters — Field Descriptions. . . . . . . . . . . . . . 4-122

Table 4-63. PERSISTENT RESERVE OUT Parameter List Field Relevance . . . . . . . . . . . . . . . 4-123

T able 4-64. PREVENT/ALLOW MEDIUM REMOVAL (1Eh) Command Descriptor Block — Field

Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-125

T able 4-65. READ (08h) Command Descriptor Block — Field Descriptions . . . . . . . . . . . . . . . 4-126

T able 4-66. READ BLOCK LIMITS (05h) Command Descriptor Block and Data — Field

Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-130

T able 4-67. READ BUFFER (3Ch) Command Descriptor Block — Field Descriptions. . . . . . . 4-131

Table 4-68. READ BUFFER Header — Field Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-132

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List of Tables DLT VS160 SCSI Interface Guide

Table 4-69. READ BUFFER Descriptor — Field Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . 4-133

T able 4-70. READ BUFFER Read Echo Buffer Descriptor — Field Descriptions . . . . . . . . . . . 4-135

T able 4-71. READ POSITION (34h) Command Descriptor Block — Field Descriptions. . . . . . 4-136

Table 4-72. READ POSITION Data (Short Format) — Field Descriptions. . . . . . . . . . . . . . . . . 4-138

T able 4-73. READ POSITION Data (Long Format) — Field Descriptions. . . . . . . . . . . . . . . . . 4-139

T able 4-74. RECEIVE DIAGNOSTICS RESULTS (1Ch) Command Descriptor Block — Field

Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-141

T able 4-75. RELEASE (6) (17h) Command Descriptor Block — Field Descriptions . . . . . . . . . 4-143

T able 4-76. RELEASE (10) (57h) Command Descriptor Block — Field Descriptions . . . . . . . . 4-145

T able 4-77. REPORT DENSITY SUPPORT (44h) Command Descriptor Block — Field

Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-147

Table 4-78. REPORT DENSITY SUPPORT Header — Field Descriptions. . . . . . . . . . . . . . . . . 4-148

T able 4-79. REPOR T DENSITY SUPPORT Data Block Descriptor — Field Descriptions . . . . 4-150

T able 4-80. REPORT DEVICE IDENTIFIER (A3h) Command Descriptor Block — Field

Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-152

T able 4-81. REPORT DEVICE IDENTIFIER (A3h) Parameter List Format — Field

Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-153

T able 4-82. REPORT LUNS (A0h) Command Descriptor Block — Field Descriptions . . . . . . . 4-154

Table 4-83. REPORT LUNS (A0h) Parameter List — Field Descriptions. . . . . . . . . . . . . . . . . . 4-155

T able 4-84. REQUEST SENSE (03h) Command Descriptor Block — Field Descriptions . . . . . 4-156

T able 4-85. REQUEST SENSE (03h) Data — Field Descriptions. . . . . . . . . . . . . . . . . . . . . . . . 4-158

T able 4-86. Supported Sense Keys for REQUEST SENSE (03h) Command. . . . . . . . . . . . . . . . 4-159

T able 4-87. Supported ASC / ASCQ (Hex) for REQUEST SENSE (03h) Command . . . . . . . . . 4-160

T able 4-88. RESERVE (6) (16h) Command Descriptor Block — Field Descriptions . . . . . . . . . 4-165

T able 4-89. RESERVE (10) (56h) Command Descriptor Block — Field Descriptions . . . . . . . . 4-168

T able 4-90. REWIND (01h) Command Descriptor Block — Field Descriptions. . . . . . . . . . . . . 4-170

T able 4-91. SEND DIAGNOSTIC (1Dh) Command Descriptor Block — Field Descriptions . . 4-171 T able 4-92. SET DEVICE IDENTIFIER (A4) Command Descriptor Block — Field

Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-173

T able 4-93. SET DEVICE IDENTIFIER (A4) Parameter List — Field Descriptions . . . . . . . . . 4-174

Table 4-94. SPACE Command (11h) Command Descriptor Block — Field Descriptions. . . . . . 4-175

T able 4-95. TEST UNIT READY (00h) Command Descriptor Block — Field Descriptions . . . 4-177

T able 4-96. WRITE (0Ah) Command Descriptor Block — Field Descriptions . . . . . . . . . . . . . . 4-179

T able 4-97. WRITE BUFFER (3Bh) Command Descriptor Block — Field Descriptions. . . . . . 4-180

T able 4-98. WRITE FILEMARKS (10h) Command Descriptor Block — Field Descript ions . . 4-183

xiv December 2003 002202-01

DLT VS160 SCSI Interface Guide List of Tables

5Medium Chang e r De v ice Comm ands . . . . . . . . . . . . . . . . . . . . 5-1

Table 5-1. SCSI-2 Medium Changer Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Table 5-2. INITIALIZE ELEMENT STATUS (07h) Command Descriptor Block — Field

Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

T able 5-3. LOG SENSE (4Dh) — Supported Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

T able 5-4. MODE SELECT (15h/55h) — Supported Pages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

T able 5-5. MODE SELECT Parameter List — Field Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

T able 5-6. MODE SELECT Changeable Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Table 5-7. MODE SENSE (1Ah/5Ah) — Supported Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

Table 5-8. MODE SENSE Parameter List — Field Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

T able 5-9. Element Address Assignment MODE SENSE Page (1Dh) — Field Descriptions . . . . 5-15

Table 5-10. Medium Changer Element Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15

T able 5-11. Device Capabilities MODE SENSE Page (1Fh) — Field Descriptions. . . . . . . . . . . . 5-17

T able 5-12. MOVE MEDIUM (A5h) Command Descriptor Block — Field Descriptions . . . . . . 5-19

T able 5-13. READ ELEMENT ST ATUS (B8h) Command Descriptor Block — Field

Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20

T able 5-14. READ ELEMENT STATUS Data Header — Field Descriptions . . . . . . . . . . . . . . . . 5-22

T able 5-15. READ ELEMENT ST ATUS Page Header — Field Descripti ons. . . . . . . . . . . . . . . . 5-23

Table 5-16. Storage Element Descriptor — Field Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25

Table 5-17. Data Transfer Descriptor — Field Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-27

ASCSI Commands U n der Reserv a tion . . . . . . . . . . . . . . . . . . . . .A - 1

Table A-1. SCSI Co mmand Behavio r During RESERVE (6) or RESERVE (10) . . . . . . . . . . . . . .A-1

Table A-2. SCSI Co mmand Behavio r During Persistent Reserv ations. . . . . . . . . . . . . . . . . . . . . . .A-3

T able A-3. Conditional Reaction Based Upon Service Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

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List of Tables DLT VS160 SCSI Interface Guide

xvi December 2003 002202-01

DLT VS160 SCSI Interface Guide

Introduction 002202-01

List of Figures

3SCS I M essages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Figure 3-1. Extended Messages — Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Figure 3-2. Two-byte Messages — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Figure 3-3. IDENTIFY (80h–FFh) — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Figure 3-4. IGNORE WIDE RESIDUE (23h) — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Figure 3-5. PARALLEL PROTOCOL REQUEST (Ext. Message 04h) — Data Format. . . . . . . . 3-19

Figure 3-6. SYNCHRONOUS DATA TRANSFER REQUEST (Ext. Message 01h) — Data

Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24

Figure 3-7. WIDE DATA TRANSFER REQUEST (Ext. Message 03h) — Data Format . . . . . . . 3-25

4SCS I C o mmands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Figure 4-1. ERASE (19h) Command Descriptor Block — Data Format . . . . . . . . . . . . . . . . . . . . . 4-4

Figure 4-2. INQUIRY (12h) Command Descriptor Block — Data Format . . . . . . . . . . . . . . . . . . . 4-5

Figure 4-3. INQUIRY (12h) Standard Data — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Figure 4-4. INQUIRY (12h) Vendor Unique Bytes — Data Format. . . . . . . . . . . . . . . . . . . . . . . . 4-10

Figure 4-5. INQUIRY (12h) Supported Vital Product Data Page — Data Format. . . . . . . . . . . . . 4-12

Figure 4-6. INQUIRY (12h) Unit Serial Number Page — Data Format. . . . . . . . . . . . . . . . . . . . . 4-13

Figure 4-7. INQUIRY (12h) Device Identifi cation Page — Data Format . . . . . . . . . . . . . . . . . . . 4-14

Figure 4-8. Identifier Descriptors — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Figure 4-9. INQUIRY (12h) Firmware Build Informa tion Page — Data Format. . . . . . . . . . . . . . 4-17

Figure 4-10. INQUIRY (12h) Command Support Data — Data Format . . . . . . . . . . . . . . . . . . . . 4-18

Figure 4-1 1. LOAD/UNLOAD (1Bh) Command Descriptor Block — Data Format. . . . . . . . . . . 4-21

Figure 4 -1 2 . L O C ATE (2Bh) Command D es c r ip t o r B l o ck — D a t a Fo r m a t . . . . . . . . . . . . . . . . . . 4-23

Figure 4-13. LOG SELECT (4Ch) Command Descriptor Block — Data Format . . . . . . . . . . . . . 4-25

Figure 4-14. LOG SELECT Log Page Header — Header Format . . . . . . . . . . . . . . . . . . . . . . . . . 4-28

Figure 4-1 5 . LOG SELECT Log Page Paramete rs — Data Format . . . . . . . . . . . . . . . . . . . . . . . . 4-29

Figure 4-16. LOG SENSE (4Dh) Command Descriptor Block — Data Format . . . . . . . . . . . . . . 4-32

Figure 4-17. Supported Pages LOG SENSE Page — Data Format . . . . . . . . . . . . . . . . . . . . . . . . 4-35

Figure 4-18. Read/Write Error LOG SENSE Page Header — Header Format. . . . . . . . . . . . . . . . 4-36

002202-01 December 2003 xvii

List of Figures DLT VS160 SCSI Interface Guide

Figure 4-1 9 . Read/Write Er ror LOG SENSE Page — Data Format . . . . . . . . . . . . . . . . . . . . . . . . 4-37

Figure 4-2 0 . Last n Error Events LOG SENSE Pa g e Header — Header Format . . . . . . . . . . . . . . 4-39

Figure 4-2 1 . Last n Error Events LOG SENSE Pa g e Parameter s — Data Format. . . . . . . . . . . . . 4-40

Figure 4-22. TapeAlert Log Page LOG SENSE Page Header — Header Format . . . . . . . . . . . . . 4-42

Figure 4-23. TapeAlert LOG SENSE Page Parameters — Data Format . . . . . . . . . . . . . . . . . . . . 4-43

Figure 4-24. Read/Write Compression Ratio LOG SENSE Page Header — Header Format . . . . 4-46

Figure 4-2 5 . Read/Write Comp ression Ratio LOG SENSE Page — Data Format. . . . . . . . . . . . . 4-47

Figure 4-26. Read/Write Compression Ratio LOG SENSE Page Parameter Codes

(00h and 01h) — Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-48

Figure 4-27. Read/Write Bytes Transferred LOG SENSE Page Parameter Codes

(02h through 09h) — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-49

Figure 4-2 8 . Device Wellness LOG SEN SE Page Header — Header Format . . . . . . . . . . . . . . . . 4-51

Figure 4-2 9 . Device Wellness LOG SEN SE Page Paramete rs — Data Format . . . . . . . . . . . . . . . 4-52

Figure 4-30. Device Status LOG SENSE Page Header — Header Format . . . . . . . . . . . . . . . . . . 4-54

Figure 4-31. Device Status LOG SENSE Page Parameters — Data Format . . . . . . . . . . . . . . . . . 4-55

Figure 4-32. Device Status LOG SENSE Page Parameter Code (0001h). . . . . . . . . . . . . . . . . . . . 4-56

Figure 4-33. MODE SELECT (6) (15h) Command Descriptor Block — Data Format . . . . . . . . . 4-57

Figure 4-34. MODE SELECT (10) (55h) Command Descriptor Block — Data Format . . . . . . . . 4-57

Figure 4-35. MODE SELECT (6) Mode Page Parameter Header — Header Format . . . . . . . . . . 4-59

Figure 4-36. MODE SELECT (6) Mode Page Parameter Block Descriptor — Data Format . . . . 4-60

Figure 4-37. MODE SELECT (6) Mode Page Parameter Descriptors — Data Format. . . . . . . . . 4-60

Figure 4-38. MODE SELECT (10) Mode Page Parameter Header — Header Format . . . . . . . . . 4-60

Figure 4-39. MODE SELECT (10) Mode Page Parameter Block Descriptor — Data Format . . . 4-61

Figure 4-40. MODE SELECT (10) Mode Page Parameter Descriptors — Data Format . . . . . . . . 4-61

Figure 4-41. Read/Write Error Recovery MODE SELECT Page — Data Format. . . . . . . . . . . . . 4-64

Figure 4-42. Disconnect/Reconnect MODE SELECT Page — Data Format. . . . . . . . . . . . . . . . . 4-65

Figure 4-43. Control Mode MODE SELECT Page — Data Format. . . . . . . . . . . . . . . . . . . . . . . . 4-67

Figure 4-44. Data Compression MODE SELECT Page — Data Format . . . . . . . . . . . . . . . . . . . . 4-69

Figure 4-45. Device Configuration MODE SELECT Page — Data Format . . . . . . . . . . . . . . . . . 4-71

Figure 4-46. Medium Partition MODE SELECT Page — Data Format. . . . . . . . . . . . . . . . . . . . . 4-73

Figure 4-47. TapeAlert MODE SELECT Page — Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-74

Figure 4-48. EEPROM Vendor Unique MODE SELECT Page — Data Format . . . . . . . . . . . . . . 4-78

Figure 4-49. EEPROM Vendor Unique Page — Example 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-80

Figure 4-50. EEPROM Vendor Unique Page — Example 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-80

Figure 4-51. MODE SENSE (6) (1Ah) Command Descriptor Block — Data Format. . . . . . . . . . 4-82

Figure 4-52. MODE SENSE (10) (5Ah) Command Descriptor Block — Data Format. . . . . . . . . 4-83

Figure 4-5 3 . MODE SENSE (6) Mode Page Parameter Header — Header Format. . . . . . . . . . . . 4-84

Figure 4-54. MODE SENSE (10) Mode Page Parameter Header — Header Format. . . . . . . . . . . 4-85

Figure 4-5 5 . MODE SENSE (6/1 0 ) Block Descri p tor — Data Format . . . . . . . . . . . . . . . . . . . . . 4-87

Figure 4-56. Read/Write Error Recovery MODE SENSE Page — Data Format . . . . . . . . . . . . . . 4-89

xviii December 2003 002202-01

DLT VS160 SCSI Interface Guide Li st of Figures

Figure 4-57. Disconnect / Reconnect MODE SENSE Page — Data Format . . . . . . . . . . . . . . . . . 4-90

Figure 4-58. Control Mode MODE SENSE Page — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . 4-92

Figure 4-5 9 . Data Compression MODE SENSE Page — Data Format . . . . . . . . . . . . . . . . . . . . . 4-94

Figure 4-60. Device Configuration MODE SENSE Page — Data Format. . . . . . . . . . . . . . . . . . . 4-96

Figure 4-6 1 . Medium Par t i tion MODE SENSE Page — Data Format. . . . . . . . . . . . . . . . . . . . . . 4-98

Figure 4-62. TapeAlert MODE SENSE Page — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-99

Figure 4-63. EEPROM Vendor Unique MODE SENSE Page — Data Format . . . . . . . . . . . . . . 4-102

Figure 4-64. PERSISTENT RESERVE IN (5Eh) Command Descriptor Block — Data Format . 4-103

Figure 4-65. PERSISTENT RESERVE IN Read Keys Parameters — Data Format . . . . . . . . . . 4-104

Figure 4-66. PERSISTENT RESERVE IN Read Reservations Parameters — Data Format . . . . 4-106

Figure 4-67. PERSISTENT RESERVE IN Read Reservations Descriptor — Data Format. . . . . 4-107

Figure 4-68. PERSISTENT RESERVE OUT (5Fh) Command Descriptor Block — Data Format4-111

Figure 4-69. PERSISTENT RESERVE OUT Parameter List — Data Format. . . . . . . . . . . . . . . 4-122

Figure 4-70. PREVENT/ALLOW MEDIUM REMOVAL (1Eh) Command Descriptor Block — Data

Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-125

Figure 4-71. READ (08h) Command Descriptor Block — Data Format . . . . . . . . . . . . . . . . . . . 4-126

Figure 4-72. READ BLOCK LIMITS (05h) Command Descriptor Block — Data Format. . . . . 4-129

Figure 4-73. READ BLOCK LIMITS Data — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-129

Figure 4-74. READ BUFFER (3Ch) Command Descriptor Block — Data Format. . . . . . . . . . . 4-131

Figure 4-75. READ BUFFER Header — Header Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-132

Figure 4-76. READ BUFFER Descriptor — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-133

Figure 4-77. READ BUFFER Read Echo Buffer Descriptor — Data Format . . . . . . . . . . . . . . . 4-135

Figure 4-78. READ POSITION (34h) Command Descriptor Block — Data Format . . . . . . . . . 4-136

Figure 4-7 9 . READ POSITIO N Dat a (Short Forma t ) — Data Format. . . . . . . . . . . . . . . . . . . . . 4-137

Figure 4-80. READ POSITION Data (Long Format) — Data Format. . . . . . . . . . . . . . . . . . . . . 4-139

Figure 4-81. RECEIVE DIAGNOSTICS RESULTS (1Ch) Command Descriptor Block — Data

Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-141

Figure 4-82. RECEIVE DIAGNOSTICS RESULTS — Data Format . . . . . . . . . . . . . . . . . . . . . 4-142

Figure 4-83. RELEASE (6) (17h) Command Descriptor Block — Data Format . . . . . . . . . . . . . 4-143

Figure 4-84. RELEASE (10) (57h) Command Descriptor Block — Data Format . . . . . . . . . . . . 4-145

Figure 4-85. REPORT DENSITY SUPPORT (44h) Command Descriptor Block — Data Format4-147

Figure 4-86. REPORT DENSITY SUPPORT Header — Header Format . . . . . . . . . . . . . . . . . . 4-148

Figure 4-87. REPORT DENSITY SUPPORT Data Block Descriptor — Data Format . . . . . . . . 4-149

Figure 4-88. REPORT DEVICE IDENTIFIER (A3h) Command Descriptor Block — Data

Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-152

Figure 4-89. REPORT DEVICE IDENTIFIER Parameter List Format — Data Format . . . . . . . 4-153

Figure 4-90. REPORT LUNS (A0h) Command Descriptor Block — Data Format. . . . . . . . . . . 4-154

Figure 4 -9 1 . RE P ORT LUNS Par ameter Lis t — D at a Fo rmat . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 5 5

Figure 4-92. REQUEST SENSE (03h) Command Descriptor Block — Data Format. . . . . . . . . 4-156

Figure 4-93. REQUEST SENSE Data — Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-157

002202-01 December 2003 xix

List of Figures DLT VS160 SCSI Interface Guide

Figure 4-94. RESERVE (6) (16h) Command Descriptor Block — Data Format . . . . . . . . . . . . . 4-164

Figure 4-95. RESERVE (10) (56h) Command Descriptor Block — Data Format . . . . . . . . . . . . 4-167

Figure 4-96. REWIND (01h) Command Descriptor Block — Data Format. . . . . . . . . . . . . . . . . 4-170

Figure 4-97. SEND DIAGNOSTIC (1Dh) Command Descriptor Block — Data Format . . . . . . 4-171

Figure 4-98. SET DEVICE IDENTIFIER (A4h) Command Descriptor Block — Data Format . 4-173

Figure 4 -9 9 . SE T DE V ICE IDE N T IFIER Pa ra m e t er L i st— Data Fo r mat. . . . . . . . . . . . . . . . . . 4-1 7 4

Figure 4-100. SPACE Command (11h) Command Descriptor Block — Data Format. . . . . . . . . 4-175

Figure 4-101. TEST UNIT READY (00h) Command Descriptor Block — Data Format . . . . . . 4-177

Figure 4-102. WRITE (0Ah) Command Descriptor Block — Data Format. . . . . . . . . . . . . . . . . 4-178

Figure 4-103. WRITE BUFFER (3Bh) Command Descriptor Block — Data Format. . . . . . . . . 4-180

Figure 4-104. WRITE FILEMARKS (10h) Command Descriptor Block — Data Format . . . . . 4-183

5Medium Chang e r De v ice Comm ands . . . . . . . . . . . . . . . . . . . . 5-1

Figure 5-1. INITIALIZE ELEMENT STATUS (07h) Command Descriptor Block — Data Format5-3

Figure 5-2. Supported Pages LOG SENSE Page — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Figure 5-3. MODE SELECT (6) Mode Parameter Header — Header Format. . . . . . . . . . . . . . . . . 5-7

Figure 5-4. MODE SELECT (6) Mode Parameter Block Descriptor — Data Format . . . . . . . . . . . 5-7

Figure 5-5. MODE SELECT (10) Mode Parameter Header — Header Format. . . . . . . . . . . . . . . . 5-8

Figure 5-6. MODE SELECT (10) Mode Parameter Block Descriptor — Data Format. . . . . . . . . . 5-8

Figure 5-7 . MODE SENSE (6) Mode Parameter H eader — Header For mat . . . . . . . . . . . . . . . . . 5-11

Figure 5-8. MODE SENSE (6) Mode Parameter Block Descriptor — Data Format . . . . . . . . . . . 5-12

Figure 5-9. MODE SENSE (10) Mode Parameter Header — Header Format . . . . . . . . . . . . . . . . 5-12

Figure 5-10. MODE SENSE (10) Mode Parameter Block Descriptor — Data Format . . . . . . . . . 5-12

Figure 5-1 1. Element Address Assignment MODE SENSE Page (1Dh) — Data Format . . . . . . . 5-14

Figure 5-12. Device Capabilities MODE SENSE Page (1Fh) — Data Format . . . . . . . . . . . . . . . 5-17

Figure 5-13. MOVE MEDIUM (A5h) Command Descriptor Block — Data Format . . . . . . . . . . 5-19

Figure 5-14. READ ELEMENT STATUS (B8h) Command Descriptor Block — Data Format . . 5-20

Figure 5-15. READ ELEMENT STA TUS Data — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21

Figure 5-16. READ ELEMENT STATUS Data Header — Header Format . . . . . . . . . . . . . . . . . . 5-22

Figure 5-17. READ ELEMENT STATUS Page Header — Header Format. . . . . . . . . . . . . . . . . . 5-23

Figure 5-1 8 . Storage Element De s criptor — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24

Figure 5-19. Data Transfer Descriptor — Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26

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DLT VS160 SCSI Interface Guide

Introduction 002202-01

1.1 Purpose and Scope

This manual provides a detailed explanation of the SCSI Protocol features that the DLT VS160 tape drive implements. This manual is not intended to replace the full ANSI SCSI specification, messages, options, and command code specifications, but instead describes the commands, messages, and options this tape drive supports. It also describes the tape drive’s error recovery procedures.

CHAPT ER 1

Chapter 1Intr oduc tion

NOTE: From this point forward, the DLT VS160 tape drive is referred to simply

as the “tape driv e.”

1.2 Audience

This document is pro vided for so ftware and firmware engineers a nd tec hnicians who supp ort Quantum DLT VS160 tape drives. It also serves software and firmwar e engineers and technicians who integr ate Quantum DLT VS160 tape drives into automated systems such as tape libraries.

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Chapter 1: Introduct i on DLT VS160 SCSI Interface Guide

1.3 Related Documents

• DLT VS160 Tape Drive Installation and Operations Guide (81-81 191-01)

• Current standards docu ments available from www.t10.org

 SCSI Architecture Model (SAM)  SCSI Primary Commands (SPC)  SCSI Parallel Interfac e (SPI)  SCSI Stream Commands (SSC)

1.4 Structure of this Manual

Chapter 1, “Introduction,” is the chapter you are currently reading.

Chapter 2, “General SCSI B us Operat ion,” defines gene ral SCSI bus o peration, i ncluding data transf er ,

SCSI IDs, power- on and SCSI bus resets, data cache, and other SCSI functionality.

Chap ter 3, “SCSI Messages,” describ es the SC SI me s sag e sys tem, which allow s com mu ni cati o n

between an initiator and a targe t for the purpose of physical path management. This chapt er includes the supported SCSI messages, and describes the initiator/target interaction.

Chap ter 4, “SCSI Comm ands,” lists all of the supported S CSI commands, defines their use in this ta pe

drive, and identifies their data format and field descriptions.

Chapter 5, “Medium Changer Device C ommands,” lists all of the supported SCSI-2 medium changer

device commands, defines their use in this tape drive, and identifies their dat a format and field descriptions.

Appendix A, “SCSI Commands Under Reservation,” contains tabl es that list how the SCSI commands

supported by the tape drive behave during the various types of reservations that are available to an initiator.

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DLT VS160 SCSI Interface Guide Chapter 1: Introd ucti on

1.5 Conventions Used in This Manual

This manual uses the following conve ntions:

NOTE: Notes provide supplemental information.

TECH TIP: Tech Tips provide information that helps you comple te a procedure or

avoid additional steps.

CAUTION Cautions provide information you mus t know to avoid

damaging the tape drive or losing data.

WARNING! Warnings provide information you must know to avoid

personal injury.

Table 1-1. Typographical Conventions

Element Convention Example

Comman d s Uppercase (unless case-

sensitive)

Hexadecimal Notation Number followed by

lower case h

Binary Notation Number followed by

lower case b Decimal Notation Number without su ffix 512 Acronyms Uppercase POST Abbreviations Lowercase, except where

standard usage requi res

uppercase

TEST UNIT READY

25h

101b

Mb (megabits) MB (mega b y tes)

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Chapter 1: Introduct i on DLT VS160 SCSI Interface Guide

1.6 SCSI Command Descriptions

The SCSI command descriptions contain detailed information about each command the tape drive supports. The SCSI commands are presented in alphabetical order. Fields common to many of the SCSI commands are not repeated for every command; instead they are supported as follows:

Table 1-2 . SCSI Command Conventions

Name of Field How Field is Supported in SCSI Commands

LUN Logical Unit Number. LUN for the tape drive is 0. Control All SCSI commands must have a Control byte, which is

implemented as described in SCSI Architecture Model – 3 (SAM–3).

Reserved Reserved bits, fields, bytes, and code values are set aside

for future standardization and must be set to 0. If the tape drive receives a command that contains non-zero bits in a reserved field or a reserved code value, the tape drive terminates the command with a CHECK CONDITION status and the Sense Key is set to ILLEGAL REQUEST.

Throughout this manual, multiple bytes that contain information about specific command parameters are portrayed as shown below in the example from the Paramete r List Length field (bytes 7 to 8) of the LOG SELECT command, shown as follows:

Bit

Byte

7 – 8

7 6 5 4 3 2 1 0

(Bytes 0 – 6)

(MSB)

Parameter List Leng t h

(LSB)

This sample indicates that the most significant bit (MSB) of the field is bit 7 of byte 7; the least significant bit is bit 0 of byt e 8. The shor thand version of presentation is used in this manual to save space.

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DLT VS160 SCSI Interface Guide Chapter 1: Introd ucti on

This is an alterna te, “sh o rth an d” pr es ent ation fo r:

Bit

Byte

7 (MSB)

7 6 5 4 3 2 1 0

(Bytes 0 – 6)

Parameter List Leng t h

(LSB)

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Chapter 1: Introduct i on DLT VS160 SCSI Interface Guide

1-6 December 2003 002202-01

DLT VS160 SCSI Interface Guide General SCSI Bus Ope ration

002202-01

Chapter 2General SC SI Bu s Operation

2.1 Data Transfer

CHAPT ER 2

The tape drive supports both, narrow and wide, asynchronous and synchronous data tran sfers. The product is configured as a Low-Voltage Differen tial (L VD) or Single-Ended (SE) device. Parity (ODD) is generated during all inf ormation transfer phases where the device tran sfers data onto the SCSI bus. Parity is checke d duri ng all info rm ati on tr ans fer phas es whe re d ata is tra n sferred back from the SC SI bus.

The tape drive supports even block siz es of 2 bytes to (16 MB – 2) bytes.

Disconnects from the SCSI bus occur at regular intervals during a data transfer. This allows other devices to access the bus. The Disconnect–Reconnect Mode Parameters page configures SCSI bus disconnects.

2.2 Initiator/Target Operation

The tape driv e does not act as an initiator on the SCSI bus. Therefore, the device does not perform any of the following:

• Generate unsolicited interrupts to the host

• Initiate its own SCSI commands

• Assert bus reset.

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Chapter 2: General SCSI Bus O peration DLT VS160 SCSI Interf ace Guide

2.3 SCSI IDs and Logical Unit Numbers (LUNs)

The tape drive has one logical unit number, which is always LUN 0.

Unsupported LUNs are treated as follows: If the LUN specified in the IDENTIFY message is invalid, the tape drive accepts the command descri ptor block (CDB). The next action is one of the following three cases:

1. If the command is INQUIR Y, the targe t returns the INQUIRY data with the peripheral qualifier set

to 011, indicating that the target does not support the LUN in que stion.

2. If the command is REQUEST SENSE, the target returns Sense data. The Sense Key is ILLEGAL

REQUEST, with an additional sense code of INVALID LOGICAL UNIT NUMBER.

3. For any other command, the target terminates the command with CHECK CONDITION status and

generates the Sense data described in item 2 above.

2.4 Unit Attention Condition

The tape drive implements queued unit attentions which are mainta ined separa tely fo r each valid LUN for each Initiator. Unit attentions are created under the following conditions:

• Power-on reset

• Bus reset

• BUS DEVI CE RESE T me s sag e

• When the media may have changed asynchronously

• Another initiator changed the Mode parameters or Log parameters

• A firmware (microcode) updat e has comple ted.

Two queued Unit Attentions are not unusual. For example, if a tape drive is powered on and a data cartridge is loaded, Power Up and Not-ready to Ready Transition unit attentions are created. Since there are a limited number of Unit Attention Buffers, if an initiator does not clear the unit attentions queued for it, at some point the tape drive will stop generating new unit attentions for that initiatorLUN combination. Existing unit attentions remain queued, however.

NOTE: A LOAD command does not generate a unit attention for the initiator that

issued the command since the transition to Ready is a synchronous event.

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DLT VS160 SCSI Interface Guide Chapter 2: General SCSI Bus Operation

2.5 Behavior Around Power-on and SCSI Bus Reset

You can expect and rely on the following behavior when a power-on or SCSI bus reset event occurs:

• All device SCSI lines go to high impedance when the tape drive is powered off.

• The tape drive does not generate any spurious signals on the SCSI bus at power-on.

• Within 5 seconds of power-on and within 250 milliseconds (typically under 4 ms) after a Bus

Reset, the tape drive responds to SCSI bus sel ections and returns appropriate , normal responses. Tape motion commands are returned with CHECK CONDITION status, Sense Key set to NOT READY, until the media is ready.

• The Hard Bus Reset option is implemented.

• The media is rewound to BOP (Beginning of Partition, in other words, Beginning of Tape).

The tape drive recognizes multiple bus resets in succession and bus resets of arbitrarily long duration. It recovers within the time lim its specified above following the last bus reset.

2.6 Data Cache and Tape Write Interaction

The tape drive contains a data cache that buffers blocks (records) until they are written. This section specifies times when block s are written to tape. A MODE SELECT parameter allows the dat a cache to be disabled (unbuff ered mode). In this mode, every WRITE command causes the data to be written to the media before the Status byte and the COMMAND COMPLETE messages are returne d to the host.

NOTE: Unbuffered Mode is not recommended because it causes poor

performance.

The write data cache is written (flushed) to the media under the following circumstances:

• When one or more WRITE FILEMARKS commands are issued without intervening tape motion commands.

• When a WRITE 0 FIL E MARKS comma n d is issued .

• If data remains in the cache longer than specified by the value of the MODE SELECT parameter

Write Delay Time.

• When a non-write-type media acce ss command is rec eived, for example, SPACE, READ, UNLOAD, or REWIND.

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Chapter 2: General SCSI Bus O peration DLT VS160 SCSI Interf ace Guide

2.7 Other SCSI Functionality

The tape drive supports SCSI linked co mmands.

2.8 Bus Phases

The tape drive conforms to the bus state transition table shown in the SCSI-2 standard, “Phase Sequences.” The informati on in the following sections also applies.

2.8.1 ATTENTION Signal Response

The tape drive responds to an ATN condition at least a t every phase transition, as long as the initiator sets the ATN bit before the target abandons the REQ for the last byte of the previous phase. Ord inarily the tape drive immediately recognizes ATN and changes the bus phase to MESSAGE-OUT.

2.8.2 STATUS Phase

The tape drive enters the STATUS phase only once per command unless the initiator requests a retry. The sole exception to this behavior is during er ror cases when the ta pe drive goes immediatel y to BUS FREE, as defined in the SCSI-2 standard.

The tape drive returns the following Status bytes:

• GOOD (00h): This status indicates the tape drive successfully completed the command.

• CHECK CONDITION (02h): A contingent allegiance conditio n occurred. The REQUEST SENSE

command should be sent following this sta tus to determine the nature of the event.

• BUSY (08h): The target is busy. The tape drive returns this status whenever the device is unabl e to accept a command from an otherwise acceptable initiator. The initiator should reissue the command at a later time.

• INTERMEDIATE GOOD (10h): The tape drive returns this status instead of GOOD status for commands issued with t he LINK bit s et. Followi ng the r etur n of th is stat us, the tape drive pr oceeds to the COMMAND phase for the transfer of the next linked command.

• RESERVATION CONFLICT (18h): The tape drive returns this status whenever a SCSI device attempts to access the tape drive when it has been reserved by another initiator with a RESERVE command.

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DLT VS160 SCSI Interface Guide Chapter 2: General SCSI Bus Operation

NOTE: In contrast to the BUSY status condition, the tape drive returns the

DRIVE NOT READY Sense Key as part of the Sense data following a REQUEST SENSE command. This indicates that a media access command has been issued and the media is not ready to be accessed. Fo r example, the media is not installed, the media has been unloaded, the tape drive is currently ini tializing the media to prepare it for access, etc.

In the “not ready” state, the initiator cannot perform any operation that would cause tape motion, for example, WRITE, READ, SPACE, VERIFY, and so forth. If the initiator attempts any of these commands, the tape drive returns a CHECK CONDITION status with a DRIVE NOT READY Sense Key. The initiator may, however, execute command s that do no t requ ire access to the media and the tape drive may return a GOOD status.

These are the commands that do not require media access:

• INQUIRY

• LOG SENSE/SELECT

• MODE SELECT

• MODE SENSE

• PREVENT/ALLOW MEDIUM REMOVAL

• READ BLOCK LIMITS

• READ BUF FE R

• READ ELEMENT STATUS

• RECEIVE DIAGNOSTIC RESULTS

• REQUEST SENSE

• RESERVE/RELEASE

• SEND DIAGNOSTIC (non-media access diagnostics)

• WRITE BUFFER.

NOTE: The TEST UNIT READY command is used to determine whether the

tape drive would accept a media access command without returning CHECK CONDITION status.

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Chapter 2: General SCSI Bus O peration DLT VS160 SCSI Interf ace Guide

2.8.3 BUS FREE Phase

The BUS FREE phase indicates that there is no current I/O process and that the SCSI bus is available for connecti on.

2.9 Bus Parity Errors

The occurrences of bus parity errors (in other words, single bit errors) are very se rious because they imply the possibilit y of undetected double-bit errors on the bus. These most likely would result in undetected data corr uptio n. On prope rly c onfigu red SCSI buses, parity e rrors should be extr emely ra re. If bus parity errors are det ecte d, they should be quickly addressed by improving the electrical and mechanical configuration of the SCSI bus.

A well-configured SCSI bus in most normal environments should be practically free of bus parity errors.

Bus parity errors cause the ta pe drive to go BUS FREE and prepare Sense data.

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DLT VS160 SCSI Interface Guide SCSI Messages

002202-01

3.1 SCSI Message System

CHAPT ER 3

Chapter 3SC SI Message s

The tape drive supports the messa ges li sted in Table 3-1. The message code and the direction of the message flow is also included in the following table (In = target-to-initiator, Out = initiator-to-target).

Table 3-1 . Supported SCSI Messages

Message and Code Direction

ABOR T Message (06h) Out BUS DEVICE RESET Message (0Ch) Out COMMAND COMPLETE Message (00h) In DISCONNECT Message (04h) In Extended Messages (01h) In Out Two-Byte Mes sages (2xh ) In Out IDENTIFY Message (80h–FFh) In Out IGNORE WIDE RESIDUE Message (23h) In INITIATOR DETECTED ERROR Message (05h) Out LINKED COMMAND COMPLETE Message (0Ah) In LINKED COMMAND COMPLETE WITH FLAG Message (0Bh) In MESSAGE PARITY ERROR Message (09h) Out MESSAGE REJE C T Messa ge (07h) In Out NO OPERATION Message (08h) Out PARALLEL PROTOCOL REQUEST (Extended Message 04h) In RESTORE POINTERS Message (03h) In

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Chapter 3: SCSI Messages DLT VS160 SCSI Interface Guide

Table 3-1 . Supported SCSI Messages (Continued)

Message and Code Direction

SAVE DATA POINTER Message (02h) In SYNCHRONOUS DATA TRANSFER REQUEST (Extended Message

01h) WIDE DATA TRANSFER REQUEST (Extended Message 03h) In

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DLT VS160 SCSI Interface Guide Chapter 3: SCSI Messages

3.2 Supported SCSI Messages

This section describes the messages outlined in Table 3-1.

3.2.1 Extended Messages (01h)

An initiator or targe t sends these messages as the first byte of a multiple-by te message—one that is larger than two byte s. Figure 3-1 shows the extended message data format.

Bit

Byte

0 EXTENDED MESSAGE IDENTIFIER (01h) 1 Extended Message Length 2 Extended Message Code 3 Extended Message Additional Parameters

Figu r e 3-1. Extended Messages — Data Format

The Extended Message Length specifies the length of the message, plus the number of additional parameter bytes that are to follow. The length does not include bytes 0 and 1. A value of 0 for the Extended Message Length indic ates 256 bytes to follow.

Possible extended message codes are:

00h – MODIFY DATA POINTER (not supported) 01h – SYNCHRONOUS DATA TRANSFER REQUEST 02h – Reserved 03h – WIDE DATA TRANSFER REQUEST 04h – PARALLEL PROTOCOL REQUEST (05h – 7Fh) – Reserved (80h – FFh) – Vendor Unique (not supported)

7 6 5 4 3 2 1 0

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Chapter 3: SCSI Messages DLT VS160 SCSI Interface Guide

If the tape drive receive s an extend ed message that it does not support, it switches to MESSAGE-IN phase and returns MESSAGE REJECT after all the bytes of the message have be en transferred; then the next appropriate bus pha se will be entered.

Table 3-2 . Partial Extended Message — Message Behavior

When a partial EXTENDED MESSAGE is sent to a target after…

SELECTION phase go BUS FREE, build Sense data , and does not

force a CHECK CONDITION on the next command

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase

SAVE DA TA POINTERS messa ge is sent to the init iator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

send MESSAGE R EJ ECT; if ATN is assert ed , continue to the MESSAGE-OUT phase, or else continue to the next appropriate bus phase

send MESSAGE REJECT and retry previous MESSAGE-IN phase once;

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

The targ et will…

• if unsuccessfully retried, then go BUS

FREE and build Sense data

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DLT VS160 SCSI Interface Guide Chapter 3: SCSI Messages

3.2.2 Two-Byte Messag e s (2xh)

The format for two-byte messages are shown in Figure 3-2.

Bit

Byte

0 Two-byte Message Identifier (2xh) 1 Message Argument

7 6 5 4 3 2 1 0

Figu r e 3-2. Two-byte Messages — Data Format

Possible two-byte message codes are: 20h – QUEUE SIMPLE (not supported) 21h – QUEUE ORDERED (not supported) 22h – QUEUE HEAD (not supported) 23h – IGNORE WIDE RESIDUE (24h – 2Fh) — Reserved

Table 3-3 . Partial Two-byte Message — Message Behavior

When a partial two-byte message is sent to a target after…

SELECTION phase go BUS FREE, build Sense data , and does not

force a CHECK CONDITION on the next command

The targ et will…

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase

SAVE DA TA POINTERS messa ge is sent to the init iator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

send MESSAGE R EJ ECT; if ATN is assert ed , continue to the MESSAGE-OUT phase, or else continue to the next appropriate bus phase

send MESSAGE REJECT and retry previous MESSAGE-IN phase once;

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE and build Sense data

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Chapter 3: SCSI Messages DLT VS160 SCSI Interface Guide

3.2.3 ABORT Message (06h)

The initiator sends this message to the target to clear the current I/O process on the selected device. On buffered (ca ched) write operations, the tape drive attempts to complete the command, if possible.

Table 3-4 . ABORT (06h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE with no reported errors (mult i-

byte message-out phases will be terminated early with the BUS FREE state)

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase COMMAND COMPLETE message is sent to the initiator

go BUS FREE; all I /O tasks for th e pr e s en t I-T-L nexus are aborted

3.2.4 BUS DEVICE RESET Message (0Ch)

This message from an initiator clea rs all commands, data, and status in the tape controller. When the tape drive recognizes this message, it writes the data in the cache to the media.

Table 3-5 . BUS DEVICE RESET (0Ch) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator DATA-IN or DATA-OUT phase STATUS phase COMMAND COMPLETE message is sent to the initiator

go BUS FREE; perform hard reset and set UNIT ATTENTION for all initiators

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DLT VS160 SCSI Interface Guide Chapter 3: SCSI Messages

3.2.5 COMMAND COMPLETE Message (00h)

A target sends this message to an initiator to indicate that the execution of a command or a series of linked commands has completed and valid status has been sent to the initiator.

Table 3-6 . COMMAND COMPLETE (00h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE, build Sense data , and does not

force a CHECK CONDITION on the next command

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

send MESSAGE R EJ ECT; if ATN is assert ed , continue to the MESSAGE-OUT phase, or else continue to the next appropriate bus phase

send MESSAGE REJECT and retry previous MESSAGE-IN phase once;

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE and build Sense data

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Chapter 3: SCSI Messages DLT VS160 SCSI Interface Guide

3.2.6 DISCONNECT Message (04h)

A target sends DISCONNECT to tell an initiator that the present physical path is going to be broken (the target inte nds to disconnect by releasing the BSY signal). Later, reconnect is required in order to complete the current operation. This message does not cause the initiator to save the data pointer.

Table 3-7 . DISCONNECT (04h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE, build Sense data , and does not

force a CHECK CONDITION on the next command

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

send MESSAGE R EJ ECT; if ATN is assert ed , continue to the MESSAGE-OUT phase, or else continue to the next appropriate bus phase

send MESSAGE REJECT and retry previous MESSAGE-IN phase once;

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE and build Sense data

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DLT VS160 SCSI Interface Guide Chapter 3: SCSI Messages

3.2.7 IDENTIFY Message (80h–FFh)

The initiator or tar get sends these messages to establish or re-establish the physical connection path between an init iator and target for a particular logical unit. The message byte consis ts of the following bits:

Bit

Byte

7 6 5 4 3 2 1 0

Identify DiscPriv Target

Routines

Rsv’d

(must be 0)

LUN

Figu r e 3-3. IDENTIFY (80h–FFh) — Data Format

Table 3-8 . IDENTIFY (80h–FFh) — Field Descriptions

Field Description

Identify Must be set to 1, indicating that the current message is an IDENTIFY message. DiscPriv Disconnect Privilege. May be set to 0 provided tha t no other I/O process is

currently active in the drive. If this bit is not set to 1 and other I/O processes are currently active in the drive, the drive returns BUSY status.

Target Routines

LUN Logical Unit Number.

Target Routines are not supported; this bit must be set to 0.

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Chapter 3: SCSI Messages DLT VS160 SCSI Interface Guide

When a target sends the IDENTIFY message to an initiator during reconnection, a RESTORE POINTERS message is implied.

Table 3-9 . IDENTIFY (With Another LUN) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase N/A IDENTIFY message is sent to the target

COMMAND phase MESSAGE-IN phase target re-selection SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator DATA-IN or DATA-OUT phase STATUS phase COMMAND COMPLETE message is sent to the initiator

go BUS FREE, build Sense data, and does not force a CHECK CONDITION on the next command

Table 3-1 0. IDENTIFY (Invalid) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection SAVE DATA POINTER message is sent to the initiator DATA-IN or DATA-OUT phase STATUS phase

send MESSAGE REJECT; finish bus sequence with CHECK CONDITION followed by COMMAND COMPLETE and build Sense data

DISCONNECT message is sent to the initiator go BUS FREE, build Sense data, and does not

force a CHECK CONDITION on the next command

COMMAND COMPLETE message is sent to the initiator send MESSAGE REJECT

NOTE: An invalid IDENTIFY message is one in which a reserved bit or an

unsupported bit is set.

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Table 3-11. IDENTIFY (Valid) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase COMMAND COMPLETE message is sent to the initiator

if ATN is asserted, co n ti n u e to th e M E SS A GEOUT phase, or else continue to the next appropriate bus phase

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection

• if AT N is asserted , co n ti n u e to th e

MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• Set SCSI disc onnection as requested by

init ia tor in IDENTIFY message

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator STATUS phase

DATA-IN or DATA-OUT phase go BUS FREE, build Sense data, and does not

force a CHECK CONDITION on the next command

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3.2.8 IGNORE WIDE RESIDUE Message (23h)

The target sends the IGNORE WIDE RESIDUE message to indicate that the number of valid bytes sent during the last REQ/ACK handshake and REQB/ACKB handshake of a DATA-IN phase is less than the negotiated transf er width. The ignore field indicates the number of invalid data bytes transferred. The tar get se nds t his messag e immediately f ol lowing tha t DAT A-I N phase and prior to any other messages. Figure 3-4 illustr ates the data format of an IGNORE WIDE RESIDUE message.

Bit

Byte

0 Message Code (23h) 1 IGNORE (01h)

7 6 5 4 3 2 1 0

Figu r e 3-4. IGNORE WIDE RESIDUE (23h) — Data Format

Table 3-1 2. IGNORE WIDE RESIDUE (23h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE, build Sense data, and does not

force a CHECK CONDITION on the next command

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase

send MESSAGE R EJ ECT; if ATN is assert ed , continue to the MESSAGE-OUT phase, or else continue to the next appropriate bus phase

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

send MESSAGE REJECT and retry previous MESSAGE-IN phase once;

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE and build Sense data

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3.2.9 INITIATOR DETECTED ERROR Message (05h)

An initiator se nds thi s mes s age t o in form a target tha t an erro r has occ urred (fo r exam p l e, a bus p arit y error) that does not prevent the target from attempting the operation again.

Table 3-1 3. INITIATOR DETECTED ERROR (05h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase IDENTIFY message is sent to the target target re-selection

COMMAND phase MESSAGE-IN phase SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator DATA-IN or DATA-OUT phase STATUS phase

COMMAND COMPLETE message is sent to the initiator retry previous MESSAGE-IN phase once;

go BUS FREE, build Sense data, and does not force a CHECK CONDITION on the next command

finish bus sequence with check condition followed by COMMAND COMPLETE; build Sense data

• if successful ly retried, then the bus sequenc e

completed successfully

• if unsuccessfully retried, then go BUS

FREE, build Sense data, and doe s not force a CHECK CONDITION on the next command

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3.2.10 LINKED COMMAND COMPLETE Message (0Ah)

A target sends this message to an initiator to indicate that the execution of a linked command (with the FLAG bit set to 0) is complete and that status has been sent back to the initiator. The initiator then sets the pointer s to the initial state for the next command.

Table 3-1 4. LINKED COMMAND COMPLETE (0Ah) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE, build Sense data , and does not

force a CHECK CONDITION on the next command

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

send MESSAGE R EJ ECT; if ATN is assert ed , continue to the MESSAGE-OUT phase, or else continue to the next appropriate bus phase

send MESSAGE REJECT and retry previous MESSAGE-IN phase once;

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE and build Sense data

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3.2.11 LINK ED C OMMA ND COMPLETE WITH FLAG Message (0Bh)

A target sends this message to an initiator to indicate that the execution of a linked command (with the FLAG bit set to 1) is complete and that status has been sent back to the initiator.

Table 3-1 5. LINKED COMMAND COMPLETE WITH FLAG (0Bh) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE, build Sense data , and does not

force a CHECK CONDITION on the next command

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

send MESSAGE R EJ ECT; if ATN is assert ed , continue to the MESSAGE-OUT phase, or else continue to the next appropriate bus phase

send MESSAGE REJECT and retry previous MESSAGE-IN phase once;

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE and build Sense data

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3.2.12 MESSAGE PARITY ERROR Message (09h)

The initiator se nds this message to the ta pe d rive to indicate that one or more bytes in the last message the tape drive passed on to the initi at or contained a parity error.

T o indicate that it intends to send the message, the init iator sets the ATN signal before it releases ACK for the REQ/ACK hands hake of t he messa ge that ha s the par ity error. This provides an interloc k so tha t the target (the tape drive) can determine which message has the parity error.

Table 3-1 6. MESSAGE P ARITY ERROR (09h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase IDENTIFY message is sent to the target COMMAND phase DATA-IN or DATA-OUT phase STATUS phase

MESSAGE-IN phase SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator

target re-selection COMMAND COMPLETE message is sent to the initiator

go BUS FREE, build Sense data, and does not force a CHECK CONDITION on the next command

retry previous phase once ;

• if successfully retried, then continue to the

next appropriate bus phase

• if unsuccessfully retried, then finis h bus

sequence with check condition followed by COMMAND COMPLETE and build Sense data

retry previous phase once ;

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE, build Sense data, and doe s not force a CHECK CONDITION on the next command

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3.2.13 MESSAGE REJECT Message (07h)

The initiator or tar get sends this message to indicate that the last message received was inappropriate or has not been implemented.

T o indicate its intentions of sending this messa ge, the initiator a sserts the ATN signal befor e it releases ACK for the REQ/ACK handshake of the message that is to be rejected.

MESSAGE REJECT is issued in response to any message s the tape drive considers to be illegal or not supported. When sending t o th e initi ator , t he ta pe drive iss ues a MESSAGE REJECT bef ore reque sting any additional message byte s.

Table 3-1 7. MESSAGE REJECT (07h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase target re-selection

IDENTIFY message is sent to the target COMMAND phase

MESSAGE-IN phase See the follow in g N O T E. SAVE DATA POINTER message is sent to the initiator

DISCONNECT message is sent to the initiator DATA-IN or DATA-OUT phase

STATUS phase

COMMAND COMPLETE message is sent to the initiator if ATN is asserted , co n ti n u e to th e M ES S AGE-

go BUS FREE, build Sense data, and does not force a CHECK CONDITION on the next command

send MESSAGE R EJ ECT; if ATN is assert ed , continue to the MESSAGE-OUT phase, or else continue to the next appropriate bus phase

Continue without disconnection to the next appropriate bus phase.

send MESSAGE REJECT; finish bus sequence with CHECK CONDITION followed by COMMAND COMPLETE and build Sense data

OUT phase, or else continue to the next appropriate bus phase

NOTE: This SCSI bus phase is un-reproducible without using a WIDE DATA

TRANSFER REQUEST, SYNCHRONOUS DATA TRANSFER REQUEST , or PARALLEL PROTOCOL REQUEST message; it is illegal for an initiator to reject these mandatory messages.

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3.2.14 NO OPERATION Message (08h)

If a target requests a message, the initiator sends NO OPERATION if it does not currently have any other valid message to send. The tape drive accepts the message when the tape drive is acting as a target and can send the m es sag e whe n it is an initia tor.

Table 3-1 8. NO OPERATION (08h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE, build Sense data, and does not

force a CHECK CONDITION on the next command

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase COMMAND COMPLETE message is sent to the initiator

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator

if ATN is asserted, co n ti n u e to th e M E SS A GEOUT phase, or else continue to the next appropriate bus phase

retry previous MESSAGE-IN phase onc e;

• if successful ly retried, then the bus sequenc e

completed successfully

• if unsuccessfully retried, then go BUS

FREE, and build Sense data

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3.2.15 PARALLEL PROTOCOL REQUEST (Extended Message 04h)

The PARALLEL PROTOCOL REQUEST (PPR) message allows the host and target devices to negotiate operat ing conditions of the SCSI bus. The tape drive responds to a PPR message with a reciprocal PPR message cont aining acceptable parameters for the inter face. The tape drive does not initiate th e SYNCHRONOUS DAT A TRANSFE R REQUEST message, but relie s on the ini tiator to do so.

Details about how to configur e the PPR message are shown in Table 3-19 on page 3-20.

This extended messa ge allows the target and initiator to agree on the values of the parameters releva nt to synchronous and width transfers. Figure 3-5 shows the PARALLEL PROTOCOL REQUEST data format.

Bit

Byte

0 Extended Message Identifier (01h) 1 Extended Message Lengt h (06h) 2 PARALLEL PROTOCOL REQUEST (04h) 3 Transfer Period Factor 4 Reserved 5 REQ/ACK Offset 6 Transfer Exponent 7 Reserved QAS DT IU

7 6 5 4 3 2 1 0

Figu r e 3-5. PARALLEL PROTOCOL REQUEST (Ext. Message 04h) — Data Format

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Table 3-1 9. Features of the PARALLEL PROTOCOL REQUEST Message

Field Description

Transfer Period Factor

REQ/ACK Request/Acknowledge Offset. The supported values are:

09h = 12.5 nsec Tr ans fer Period, 80 MHz 0Ah = 25 nsec Transfer Period, 40 MHz 0Ch = 50 nsec Tran sfe r P eriod, 20 MHz 19h = 100 nsec Transfer Period, 10 MHz 32h = 200 nsec Transfer Period, 5 MHz

• 00h – 0Fh for DT = 0

• 00h – 7Eh for DT = 1, with only even value s be ing allowed.

Transfer Exponent

QAS Not supported; must be set to 0. DT Double Transition. This bit indicates a request for double transition

IU Not supported; must be set to 0.

Valid transfer widths for the tape drive are 8 bits (tra ns fer width = 00h) and 16 bits (transfer width = 01h). Other transfer widths are reserved.

clocking, which me ans that two units of data are transferred for each clock cycle. Support for the PPR message is indicated b y the Clocking field in t h e Standard Inquiry page.

Table 3-2 0. PARALLEL PROTOCOL REQUEST (Ext. Message 04h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE, build Sense data, and does not

force a CHECK CONDITION on the next command

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Table 3-2 0. PARALLEL PROTOCOL REQUEST (Ext. Message 04h) — Message Behavior

When this message is sent to a target after … The targ et will…

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

issue PARALLEL PROTOCOL REQUEST response

issue PARALLEL PROTOCOL REQUEST response; retry previous MESSAGE-IN phase once

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE, build Sense data

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3.2.16 RESTORE POINTERS Message (03h)

A target sends this message to direct the initiator to restore the most recently saved pointers for the currently attached logical unit. The initiator restores pointers to the command, data, and status locations for the logical unit to the ir active (present) values. The initiator restor es command and status pointers to the beginning of the present command and status areas. The initiator restores the data pointer to the value at the beginn ing of the data area (in the absence of a SAVE DATA POINTER message), or to the value at the last SAVE DATA POINT ER message that occu rr ed for that log ical unit.

Table 3-2 1. RESTORE POINTERS (03h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE, build Sense data, and does not

force a CHECK CONDITION on the next command

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

send MESSAGE R EJ ECT; if ATN is assert ed , continue to the MESSAGE-OUT phase, or else continue to the next appropriate bus phase

send MESSAGE REJECT and retry previous MESSAGE-IN phase once;

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE and build Sense data

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3.2.17 SAVE DATA POINTER Message (02h)

A target sends this message to the initiator and saves a copy of the present active data pointe r for the logical unit curren tly attached.

As a target , the tape drive sends this m essage before disconnec t during a data transfer. It does not send a SAVE DATA POINTER message if it intends to move directly to STATUS phase.

Table 3-2 2. SAVE DATA POINTER (02h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE, build Sense data, and does not

force a CHECK CONDITION on the next command

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

send MESSAGE R EJ ECT; if ATN is assert ed , continue to the MESSAGE-OUT phase, or else continue to the next appropriate bus phase

send MESSAGE REJECT and retry previous MESSAGE-IN phase once;

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE and build Sense data

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3.2.18 SYNCH RON OUS DATA TRANSFER REQUEST (Extended Message 01h)

This extended messa ge allows the target and initiator to agree on the values of the parameters releva nt to synchronous transfers. The tape drive does not initiate the SYNCHRONOUS DATA TRANSFER REQUEST message, but relies on the initiator to do so. Figure 3-6 shows the format for this exten ded message.

Bit

Byte

0 Extended Message Identifier (01h) 1 Extended Message Lengt h (03h) 2 SYNCHRONOUS DATA TR ANSFER REQUEST (01h) 3 Transfer Period: min. = 100 nsec (19h) 4 Transfer REQ/ACK Offset: max. = 15 nsec (0Fh)

7 6 5 4 3 2 1 0

Figu r e 3-6. SYNCHRONOUS DATA TRANSFER REQUEST (Ext. Message 01h) — Data Format

Table 3-2 3. SYNCHRONOUS DA TA TRANSFER REQUEST (Ext. Message 01h) — Message

Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE, build Sense data, and does not

force a CHECK CONDITION on the next command

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Table 3-2 3. SYNCHRONOUS DA TA TRANSFER REQUEST (Ext. Message 01h) — Message

Behavior (Continued)

When this message is sent to a target after … The targ et will…

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target re-selection DATA-IN or DATA-OUT phase STATUS phase

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

issue SYNCHRONOUS DATA

TRANSFER REQUEST

issue SYNCHRONOUS DATA

response

TRANSFER REQUEST response; retry

previous MESSAGE-IN phase once

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE, build Sense data

3.2.19 WIDE DATA TRANSFER REQUEST (Extended Message 03h)

The WIDE DATA TRANSFER REQUEST message exchange establishes an agreement between two SCSI devices on the width of the data path to be used for DATA phase transfer between the two devices. All other information transfer phases use an eight-bit data path. Figure 3-7 shows the format for this extende d m es sag e.

Bit

Byte

0 Extended Message (01h) 1 Extended Message Lengt h (02h) 2 WIDE DATA TRANSFER REQUEST (03h) 3 Transfer Width Exponent

7 6 5 4 3 2 1 0

Figu r e 3-7. WIDE DATA TRANSFER REQUEST (Ext. Message 03h) — Data Format

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A SCSI device initiates a WIDE DAT A TRANSFER REQUEST message exchange whenever a previously arrang ed transfer width agreement may have become invalid. The agreement becomes invalid after any condition that leaves the data transfer agreement in an indeterminate state, including:

• After a hard reset condition

• After a BUS DEVICE RESET message

• After a power cy cle.

The tape drive im plements both the wide and synchronous data transfer options. It negotiate s the wide data transfer agreement before negotiating the synchronous data transfer agreement. If a synchronous data transfer agreement is in effect, the tape drive resets the synchronous agreement to asynchronous mode after accepting a WIDE DATA TRANSFER REQUEST message.

The transfer width is expressed as: 2

where n is the transfer width in bytes. The established tran sfer

width applies to all logical units. Valid transfer widths for the tape drive are 8 bits (m = 00h) and 16 bits (m = 01h). Va lues of m greater than (01h) are reserved.

Table 3-2 4. WIDE DATA TRANSFER REQUEST (Ext. Message 03h) — Message Behavior

When this message is sent to a target after … The targ et will…

SELECTION phase go BUS FREE, build Sense data, and does not

force a CHECK CONDITION on the next command

IDENTIFY message is sent to the target COMMAND phase MESSAGE-IN phase target reselection DATA-IN or DATA-OUT phase STATUS phase

SAVE DATA POINTER message is sent to the initiator DISCONNECT message is sent to the initiator COMMAND COMPLETE message is sent to the initiator

issue WIDE DATA TRANSFER

REQUEST response and reset t o asynchron ous

transfer mode

issue WIDE DATA TRANSFER

REQUEST response and reset t o asynchron ous

transfer mode; retry previous MESSAGE-IN phase once

• if successfully retried, then if ATN is

asserted, continue to th e MESSAGE-OUT phase, or else continue to the next appropriate bus phase

• if unsuccessfully retried, then go BUS

FREE, build Sense data

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DLT VS160 SCSI Interface Guide SCSI Commands

This chapter describes the supported SCSI commands, options, and error recovery procedures implemented in the Quantum DLT VS160 tape drive system. However, this chapter does not fully reiterate every ANSI SCSI messag e, option, and command code specification; for information of this nature, refer to the SCSI specific ation itself.

002202-01

CHAPT ER 4

Chapter 4SCSI Commands

The web sites http://www. scsita.org and http://www.t10.org are also helpful sources of information.

4.1 Control Byte — Flag and Link Bits

The control byte of the command descriptor block (CDB) contai ns the Flag and Link bits. Use of these bits is entirely at the disc retion of the initiator. Setting the Link bit provide s an automatic link to the next command, bypassing the usual ARBI TRATION, SELECTION, and MESSAGE-OUT phases that would normally occur between commands.

All other bits in the control byte are reserved or unused.

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4.2 Summary of Supported Sequential-access Device Commands

The Quantum DLT VS160 tape drive supports the SCSI commands listed in Table 4-1. The table lists each command, its operation code, and the section in this manual that describes each command.

Table 4-1 . Supported SCSI Commands

Command Operation Code Subsection

ERASE 19h Page 4-4 INQUIRY 12h Page 4-5 LOAD/UNLOAD 1Bh Page 4-21 LOCATE 2Bh Page 4-23 LOG SELECT 4Ch Page 4-25 LOG SENSE 4Dh Page 4-32 MODE SELECT 15h/55h Page 4-57 MODE SENSE 1Ah/5Ah Page 4-82 PERSISTENT RESERVE IN (SCSI-3) 5Eh Page 4-103 PERSISTENT RESERVE OUT (SCSI-3) 5Fh Page 4-111 PREVEN T/ALLOW MEDIUM REM OVAL 1Eh Page 4-125 READ 08h Page 4-126 READ BLOCK LIMITS 05h Page 4-129 READ BUFFER 3Ch Page 4-131 READ POSITION 34h Page 4-136 RECEIVE DIAGNOSTICS RESULTS 1Ch Page 4-141 RELEASE (6) 17h Page 4-143 RELEASE (10) (SCSI-3) 57h Page 4-145 REPORT DENSITY SUPPORT (SCSI-3) 44h Page 4-147 REPORT DEVICE IDENTIFIER (SCSI-3) A3h Page 4-152 REPORT LUNS (SCSI-3) A0h Page 4-154 REQUEST SENSE 03h Page 4-156

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Table 4-1 . Supported SCSI Commands (Continued)

Command Operation Code Subsection

RESERVE (6) 16h Page 4-164 RESERVE (10) (SCSI-3) 56h Page 4-167 REWIND 01h Page 4-170 SEND DIAGNOSTIC 1Dh Page 4-171 SET DEVICE IDENTIFIER (SCSI-3) A4h Page 4-173 SPACE 11h Page 4-175 TEST READY 00h Page 4-177 WRITE 0Ah Page 4-178 WRITE BUFFER 3Bh Page 4-180 WRITE FI LEM ARKS 10h Page 4-183

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4.3 ERASE Command (19h)

The ERASE command erases data on the media. Any write data current ly held in buffer memory and not yet written to the media is flushed to the media before the ERASE command executes.

Bit

Byte

0 Operation Code (19h) 1 LUN Reserved Immed Long

2 - 4 Reserved

5 Unused Reserved Flag Link

7 6 5 4 3 2 1 0

Figu r e 4-1. ERASE (19h) Command Descriptor Block — Data Format

Table 4-2 . ERASE (19h) Command Descriptor Block — Field Descriptions

Field Name Description

LUN Logical Unit Number. This field is ignored by t he ta rget , the LUN must be cha nged

within an IDENTIFY me ssa ge.

Immed Immediate. If Immed is set to 0, the target does not return status until the selected

operation has completed. If Immed is set to 1, the target returns the statu s as s oon as the operation has been initiated.

Long The L ong bit controls the distance to be erased. If the bit is set , filler and End of

Data (EOD) blocks are writte n if needed, and then the entire rest of the medi a is erased.

Note: This command i s a NO OPERATION on the tape driv e unless the L ong bit is set. Issuing the ERASE command when the media is not at the Beginning of Tape (BOT) is an ILLEGAL REQUEST.

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4.4 INQUIRY Command (12h)

The INQUIR Y command requests that information regardi ng tape dr ive parameters be sent to the initiator.

The tape drive does not need to access its media to respond to the inquiry. The tape drive can provide three categories of data in response to an INQUIRY command:

• Standard Inquir y Data — Standard Inquiry Data contains basic data about the tape drive.

• V ital Product Data — Vita l Product Data comprises several pages of addition al data. Each Vital

Product Data page requires a separate INQUIRY command from the initi ator.

• Command Support Data — Command Support Data indicates the fields in the command descriptor

block that are supported by each operat ion code.

Bit

Byte

0 Operation Code (12h) 1 LUN Reserved CmdDt EVPD 2 Page Code or Operation Code 3 Reserved 4 Allocation Length 5 Unused Reserved Flag Link

7 6 5 4 3 2 1 0

Figu r e 4-2. INQUIRY (12h) Command Descriptor Block — Data Format

The INQUIR Y command executes normally even if the specified LUN is not supported. INQUIRY returns a CHECK CONDITION status only when the tar get cannot return the requested INQUIRY data. If INQUIRY is received from an initiator with a pending ATTENTION condition (before the tape drive reports C HECK CONDITION status), the target perfo rms the INQUIRY and does not clear the ATTENTION con dition.

Table 4-3 . INQUIRY (12h) Command Descriptor Block — Field Descriptions

Field Name Description

LUN Logical Unit Number. This field is ignored by t he ta rget , the LUN must be cha nged

using an IDENTIFY message.

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Table 4-3 . INQUIRY (12h) Command Descriptor Block — Field Descriptions (Continued)

Field Name Description

CmdDt Command Support Data. A CmdDt bit of 1 and EVPD bit of 0 specifies that the

tape drive returns the command data specified by operation code field. A CmdDt bit of 0 and EVPD bit of 0 specifies that the tape drive returns the

standard inqu iry data. A CmdDt bit of 1 and EVPD bit o f 1 causes the tape return CHECK CONDITION

status with the Sense Key set to ILLEGAL REQUEST and an additional sense code of INVALID FIELD IN CDB.

EVPD Enable Vital Product Data. The tape drive im plements the Vital Product Data

pages option on LUN 0 and the optional medium loader LUN. An EVPD bit of 1 and CmdDt bit of 0 specifies that the tape drive returns the

optional vital product data specified by the page code field. An EVPD bit of 0 and CmdDt bit of 0 specifies that the tape drive returns the

standard INQUIRY data. An EVPD bit of 1 and CmdDt bit of 1 causes the tape return CHECK

CONDITION status with the Sense Key set to ILLEGAL REQUEST and an additional sense code of INVALID FIELD IN CDB.

Page Code o r Operat ion Code

When the EVPD bit is set to 1 and th e Cm dDt bit is 0, the Page/Operati on Code field specifies which page of vital product da ta information the tape drive returns. The following vit al product data pages are implemented:

Code

00h 80h

83h C0h C1h

Page Definition

Supported Vital Product Data Page (00h) Unit Serial Number Page (80h) Device Identification Page (83h) Firmware Build Information Page (C0h) Subsystem Components Revision Page (C1h)

If the Page Code field cont ains an unsupported value, the ta pe drive returns a CHECK CONDITION with ILLEGAL REQUEST Sense Key and an additional sense code of INVALID FIELD IN CDB.

When the CmdDt bi t is set to 1 and the EVPD bit is 0, the Operation Code f i eld specifies t he comm and support data information spec ified by the operation code field.

Allocation Length This specifies the maximum number of bytes that the initiator has allocated for

returned INQUIRY data. An Alloca tion Length of 0 indicates that no INQUIRY data is transfe rred. This condition is not considered an error. The tape drive terminates the DATA-IN phase when Allocation Length bytes have been transferred or when all available INQUIRY data has been transferred to the initi at o r, wh ichever is le s s .

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4.4.1 Standard INQUIRY Data

The tape drive passes back the following information in response to an INQUIRY command on the tape drive’s LUN.

Bit

Byte

0 Peripheral Q u alifier Peripheral Devi ce Type 1 RMB Device Type Modifier

3 ANEC TrmlOP Reserved Response Data Format 4 Additional Length (35h) 5 Reserved 6 Reserved MChngr Reserved 7 RelAdr WBus32 WBus16 Sync Linked Rsv’d CmdQu SftRes

8 – 15 Vendor ID

16 – 31 Product ID

7 6 5 4 3 2 1 0

ISO Version ECMA

Version

ANSI-Approved Version

32 – 35 Product Revision Level

36 – 55 Vendor Unique Bytes

56 Reserved Clocking QAS IUS 57 Reserved

Figu r e 4-3. INQUIRY (12h) Standard Data — Data Format

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Table 4-4 describes the fields for the data that the tape drive returns.

Table 4-4 . INQUIRY (12h) Standard Data Page — Field Descriptions

Field Name Description

Peripheral Qualifier The tape drive returns one of the following values in this field:

000b The indicated Periph eral Devi ce Type is connected to th e logical

unit.

001b The indicated Peripheral Device Type is not connect ed to the

logical unit, however , the tape drive is capable of supporting the indicated Peripheral Device Type at the specified logical unit.

011b The target is not capable of supporting a physical device on this

logical unit. In th is ca s e , th e P er i p heral Dev ice Type is set to 1Fh.

Peripheral Device Type On the tape drive LUN, this field is set to 01h, indicating a sequential access

device. On the medium chan ger LUN, this field is set to 08h. All other LUNs

retu rn 1Fh. RMB Removable Medium Bit. Always set to 1. Device Type Modifier Always set to 0. ISO Version Always set to 0. ECMA Version Always set to 0. ANSI-approved

This field is set to 2, indicating ANSI SCSI-2 support. Versio n

ANEC Asynchronous Eve nt Notification. Always set to 0, indicating asynchronous event

notification is not supporte d. TrmIOP T ermin ate I/O Process . Always set to 0; the TERMINATE I/O PROCESS message

is not supported. Response Data Format Set to 2, indicating INQUIRY Data is in SCSI-2 format. Additional Le ngth T he tape drive sets this fie ld to indicate the number of additional bytes of

INQUIRY Response data available. MChngr Media Changer. Always set to 0, meaning no medium changer commands will be

accepted at LUN=0 . RelAdr Relative Addressing. Always set to 0. WBus32 Wide Bus 32. Always set to 0, indicating the tape drive does not support 32-bit

wide data transfers. WBus16 Wide Bus 16. Always set to 1, indicating the tape drive supports 16-bit wide da ta

transfers.

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Table 4-4 . INQUIRY (12h) Standard Data Page — Field Descriptions (Continued)

Field Name Description

Sync Synchronous Data Transfer. Always set to 1, indicating synchronous data transfer

is supported. Linked Linked Command Support. Always set to 1, indicating linked commands are

supported. CmdQu Command Queuing. Always se t to 0. SftRes Soft Reset. Always set to 0. Vendor Identification “QUANTUM ” Product Identification “DLT VS160 ” Product Revisi on Le vel This field contains four bytes of ASCII data, which define the pr oduct’s software

revision level s. In Qua ntum produc ts, t he firmware is loc ated in EEPROM and can

be updated in the field. The Product Revision Level field changes appropriately

when a firmware update is perform ed on the tape drive. Clocking These bits indicate the level of data clocking. The y are set to 11b indi cating

double-and single-edge transfers are supported (Ultra 160). QAS Quick Arbitrate Supported. Quick Arbitrati on is not supported and thus this bit is

always 0. IUS Informati on Units Supporte d. Inform ation Unit s are not supp orted and th us this bit

is always 0.

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Vendor Unique Bytes

The following information precisely identifies the revision of the DLT VS160 tape drive subsystem co mponents.

Bit

Byte

36 Product Family Released Firmware 37 Firmware Major Version # 38 Firmware Minor Version # 39 EEPROM Format Major Version # 40 EEPROM Format Minor Version # 41 Firmware Personality 42 Firmware Subpersonality 43 Tape Directory Format Version #

44 - 46 Reserved

47 Media Loader Firmware Version # 48 Media Loader Hardware Version # 49 Media Loader Mechanical Version # 50 Media Loader Present Flag 51 Library Present Flag

7 6 5 4 3 2 1 0

(MSB)

52 – 55

Hardware Revision

(LSB)

Figu r e 4-4. INQUIRY (12h) Vendor Unique Bytes — Data Format

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Table 4-5 . INQUIRY (12h) Vendor Unique Data Page — Field Descriptions

Field Name Description

Product Family Use to determine the meaning of the Pr oduct Family bit value.

Value

Drive Density

80/160 GB (VS160)

Released Flag This flag differentiates between released and test versions of fi r mware. One

indicates released code (Vxxx) or field test code (Txxx). Released code has no

Minor Firmware V ersion number (byte 2 is 0). For tracking purposes, field test and

engineering versions of code have nonzero Minor Firmware Version numbers. Various Version

These fields are in binary, not ASCII (see Figure 4-4, Bytes 37-40, 43, 47-49). Numbers

Firmware Personali ty This field is the numeri c indicator of the firmware perso nality. Firmware

This indicates the varia nt of the firmware personality. Subpersonality

Loader Present When set to 0, indicates that no loader is present. Library Prese nt When set to 0, indicates that no li brary is present. Hardware Revision A four byte value that represents the revis ion of the hardware module.

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4.4.2 Vital Product Data Pages

The following sections show the information in the Vital Product Data Pages. The supported vital product data pages are shown in Figure 4-5.

Supported Vital Product Data Page (00h)

The supported pages are:

• Supported Vital Product Data Page (00h)

• Unit Serial Number Page (80h)

• Device Identification Page (83h)

• Firmware Build Information Page (C0h)

• Subsystem Components Revision Page (C1h) (Quantum use only).

Bit

Byte

0 Peripheral Qualifier Peripheral Device Type 1 Page Code (00h) 2 Reserved 3 Page Length (05h) 4 Supported Vital Product Dat a Page ( 00h) 5 Unit Serial Number Page (80h) 6 Device Identification Page (83h) 7 Firmware Build Information Page (C0h – Vendor Specific) 8 Subsystem Components Revision Page (C1h – Quantum use only)

7 6 5 4 3 2 1 0

Figu r e 4-5. INQUIRY (12h) Supported Vital Product Data Page — Data Format

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Unit Serial Number Page (80h)

Figure 4-6 shows the format of the Unit Serial Number page that the tape drive returns.

Bit

Byte

0 Peripheral Qualifier Peripheral Device Type 1 Page Code (80h) 2 Reserved 3 Page Length (0Ah)

4 – 13 Se rial Number

7 6 5 4 3 2 1 0

Figu r e 4-6. INQUIRY (12h) Unit Serial Number Page — Data Format

Table 4-6 . INQUIRY (12h) Unit Serial Number Page — Field Descriptions

Field Name Description

Peripheral Qualifier

Peripheral Device Type

Contains 000b if t he command is direct ed to a va lid device. Con ta ins 01 1b if there is no device at the selected LUN.

Contains 01h if the LUN is 0h, 8h if the LUN selects an attached library, or

1Fh if there is no device at the selected LUN. Page Code A value of 80h identifie s this as the Unit Serial Number page. Page Length Indicates the size of the returned Unit Seria l Num ber page. Serial Number The serial number of the printed circuit ca rd mou nted on the bottom of the

tape drive. It can be found on the bar code label. The drive returns the serial

num b er in A S CII format.

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Device Identification Page (83h)

Figure 4-7 shows the format of the Device Identification page that the tape drive returns.

Bit

Byte

0 Peripheral Qualifier Peripheral Device Type 1 Page Code (83h) 2 Reserved 3 Page Length (n-3)

4 – n Identification Descriptors

7 6 5 4 3 2 1 0

Figu r e 4-7. INQUIRY (12h) Device Identification Page — Data Format

Table 4-7 . INQUIRY (12h) Device Identification Page — Field Descriptions

Field Name Description

Peripheral Qualifier

Peripheral Device Type

Contains 000b if the command is directed to a valid device. Contains 011b if there is n o d ev i ce at th e sel ected LUN .

Contains 01h if the LUN is 0h, 8h if the LUN selects an attached library, or

1Fh if there is no device at the selected LUN. Page Code A value of 83h identifi es this as the Device Identification page. Page Length Indicates the size of the returned Devic e Identification page. Identification

Descriptors

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Refer to Figure 4-8 on page 4-15.

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Bit

Byte

7 6 5 4 3 2 1 0

0 Reserved Code Set 1 Reserved Association Identifier Type 2 Reserved 3 Identifier Length (n-3)

4 – n Identifier

Figu r e 4-8. Identifier Descr ipto rs — D at a Format

Table 4-8 . Identifier Descriptors — Field Descriptions

Field Name Description

Code Set Indicates the type of data found in the Identifier field. A value of 1 indicates

binary data. A value of 2 indi ca tes ASCII data. Association This field indicates whether the Identifier is associated with the logical unit or

the port. It is always set to 0, i ndic atin g th at the Ide nti fie r is as soci at ed wi th th e

logical unit. Identifier Type Type of identifier. (See Table 4-9 on page 4-16 for more detailed information.)

Value Description

01h Concatenation of the Vendor Name, Product ID, and Unit Serial

Number.

03h FC-PH Name_Identif ier Identifier

Length

Specifies the length in by tes of the Identifier field. If the Allocation Length

field of the CDB is too small to transfer the entire identifier, the Identifi er

Length value is not adjusted to reflect the truncation. Identifier The Identifier field contains the identifier as described by the Ide ntifier Type,

Code Set, and Identifier Length fields. Refer to Table 4-9 on page 4-16 for

details.

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The following table describe s the identifiers supported by the tape device . Table 4-9 . Device Identification — Supported Identifiers

Identifier Type

Code Set

Identifier Length

Identifier

1 2 34 QUANTUM DL T VS 16 0, 7 ASCII spa ce c haracte rs

(20h), followed by the 10 ASCII character unit serial number.

3 1 8 8 bytes of binary data indicating the 64-bit, type 5,

FC-PH Name_Identifier assigned to the tape drive.

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Firmware Build Information Page (C0h)

Figure 4-9 shows the format of the Firmware Build Information page that the tape drive returns.

Bit

Byte

0 Peripheral Qualifier Peripheral Device Type 1 Page Code (C0h) 2 Reserved 3 Page Lengt h (20h)

4 – 7 Servo Firmware Checksum

8 – 11 SCS I/R ead/Write Fir m w ar e Checks um

12 – 35 Controller Firmware Build Date

7 6 5 4 3 2 1 0

Figu r e 4-9. INQUIRY (12h) Firmware Build Information Page — Data Format

Table 4-1 0. INQUIRY (12h) Firmware Build Information Page — Field Descriptions

Field Name Description

Peripheral Qualifier

Contains 000 b if the c ommand is direc ted to a valid devi ce. Conta in s 01 1b i f there is no device at the selected LUN.

Peripheral Device Type

Page Code A value of C0h identifies this as the Firmware Build Information page. Page Length Indicates the size of the returned Firmware Build Information page. Servo Firmware

Checksum SCSI/Read/

Write Firmware Checksum

Controller Firmware Build Date

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Contains 01h if th e LUN is 0h, 8h if the LUN selects an attached lib rary, or 1Fh if there is no device at the selected LUN.

The Servo Firmware Checksum is a binary number used for positive firmware identification.

The Servo SCSI/READ/WRITE Firmware Checksums are binary numbers used for positive firmware iden tification.

Firmware Build Date. An ASCII string in DD-MM-YYYY HH:MM:SS format.

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Subsystem Components Revision Page (C1h)

This page is for Quantum use only; page content is subject to change at any time.

4.4.3 Command Support Data

The command support data informati on is sen t to the intiator by setting the CmdDt bit of the INQUIRY command to 1 and specifying the SCSI operation code of the command descriptor block (CDB) for which it wants information in the Operation Code field.

Figure 4-10 shows the format of the Command Support Data.

Bit

Byte

0 Peripheral Qualifier Peripheral Device Type 1 Reserved Support 2 ISO Version ECMA Vers ion ANSI-approved Version

3 – 4 Reserved

5 CDB Size (n – 5)

6 – n CDB Usage Data

7 6 5 4 3 2 1 0

Figu r e 4-10. INQUIRY (12h) Command Support Data — Data Format

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Table 4-11. INQUIRY (12h) Command Support Data Page — Field Descriptions

Field Name Description

Peripheral Qual ifier Contains 000b if the command is directed to a valid device.

Contains 011b if there is no device at the selected LUN.

Peripheral Devi ce Type Contains 01h if the LUN is 0h, 8h if the LUN sel ects an attached

library, or 1Fh if there is no device at the selected LUN.

Support The value in this field descri bes the type of support the drive

provides for Command Support Data:

Value Description

000b Data about the requested SCSI operation code is not

currently available. In this case, all data after Byte 1 is undefined.

001b The drive does not s upport the SCSI operation code

requested. In this case, all data after Byte 1 is

undefined. 010b Reserved. 011b The drive supports the SCSI operation code in

confo rmance with t h e SCSI standar d . 100b Vendor-specific. 101b The drive supports the SCSI operation code, but in a

vendor -specific manner. 110b Vendor-specific. 111b Reserved.

ISO Version Always se t to 0. ECMA Version Always set to 0. ANSI-approved Version This field is set to 2, indicating ANSI SCSI-2 suppo rt. CDB Size Contains the number of bytes in the CDB for the requested

OpCode and the size of th e CDB Usage Data in the data that the drive returns in response to the INQUIRY command.

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Table 4-11. INQUIRY (12h) Command Support Data Page — Field Descriptions (Continued)

Field Name Description

CDB Usage Data Contains information about the CDB for the OpCode being

queried. Note that the first byte of the CDB Usage Data contains the OpCode for the specified operation. All of the othe r bytes of the CDB Usage Data contain a map for bits in the CDB of the specifie d Op Code.

The bits in the map have a one-to- one corre sponde nce to th e CDB for the OpCode being queried. This means that if the drive se nses a bit as the entire fiel d or as part of the field of the operation, the map in the CDB Usa ge Data contains a 1 in the corresponding bit position. If the dri ve igno res a bit or decl ares a bi t as “ reserve d” i n the CDB for the OpCode being queried, the map has a 0 in the corresponding bit position.

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4.5 LOAD/UNLOAD Command (1Bh)

The LOAD/UNLOAD command informs the target to load or unload the dat a cartridge from the tape drive. If a data cartridge is not present in the tape drive, both LOAD and UNLOAD return CHECK CONDITION status with a NOT READY Sense Key set. If the tape drive has received an UNLOAD command with the Immed bit set and then receives another command involving tape motion or TEST READY, the tape drive returns a CHECK CONDITION status with a NOT READY Sense Key set.

Operation of t his command differs i f a medium changer device is present. Two modes of operation are possible, sequential mode and random mode, when a medium changer device is present. The medium changer device is under the default sequential mode after a power-on reset or SCSI bus reset. If a medium changer specific co mmand (INITIALIZE ELEMENT STATUS, MOVE MEDIUM, or READ ELEMENT ST ATUS commands) is issued to the medium changer device then the device operates in random mode and remains there until the next power-on reset or SCSI bus reset.

• In random mode, the UNLOAD portion of this command is a NO-OP when a data cartridge is present in the tape drive. If a cartr idge is not present in the tape drive the UNLOAD command returns CHECK CONDITION status with a NOT READY Sense Key set.

• In sequential mode, the command unloads the current data cartridge into the slot from which it came. The next slot’s cartridge will be automatically loaded into the tape drive only if the slot is populated.

When a data cartridge is unloaded into the last slot and circular mode is disabled, then the command exits with GOOD status and the tape drive remai ns empty. However, if circul ar mode is enabled, then the data cartridge from the next populated slot is loaded into the tape drive by wrapping from the last slot back to the first.

A medium changer device does not aff ect how the tape drive processes the LOAD portion of this command.

Bit

Byte

0 Operation Code (1Bh) 1 LUN Reserved Immed

2 - 3 Reserved

7 6 5 4 3 2 1 0

4 Reserved EOT Re-Ten Load 5 Unused Reserved Flag Link

Figure 4-1 1 . LOAD/UNLOAD (1Bh) Command Descriptor Block — Data Format

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Table 4-1 2. LOAD/UNLOAD (1Bh) Command Descriptor Block — Field Descriptions

Field Name Description

LUN Logical Unit Number. This field is ignored by t he ta rget , the LUN must be cha nged

within an IDENTIFY me ssa ge.

Immed Immediate. If this bit is set to 1, status is returned as soon a s the operation is

started. Otherwise, the status is returned after the operation has completed.

EOT End of Tap e. The tape drive ignores this bit unless both the EOT and Loa d bits are

set, th en the tape drive returns r eturns a CHECK CONDI TION status with an ILLEGAL REQUEST Sense Key set.

Re-Ten Re-tension. Re-tension operations are not needed on the tape drive, so this bit is

ignored (that is , status is GOOD, even if the bit is set).

Load When a data ca rtri dge is inse rte d, the me dia is au tomat ical ly lo ade d and pos it ion ed

by the tape drive at BOM. Lo gically, the tape drive is positioned at the beginning of Partition 0.

If the Load bit is set to 1 and the media is already loaded, no action is taken. If the Load bi t is set t o 0 and t he me dia is loade d, the tape driv e write s any b uf fered

data and filemarks to the tape, rewinds the tape to BOM, and unloads the media into the cartridge. The tape drive partially ejects the data cartridge, whic h can then be removed the rest of the way.

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4.6 L O CATE Command (2Bh)

The LOCATE command is used for high-speed positioning to the specified block address.

When writing, use the READ POSITION command to obtain the block address where particular blocks of data (for example, a data fil e) are about to be written. Then use the LOCATE command to position back to the sa me logical position for high performance restore operations of particular blocks of data.

Bit

Byte

0 Operation Code (2Bh) 1 LUN Reserved BT CP Immed 2 Reserved

3 - 6

7 Reserved 8 Partition 9 Unused Reserved Flag Link

7 6 5 4 3 2 1 0

(MSB

Block Address

Figu r e 4-12. LOCATE (2Bh) Command Descriptor Block — Data Format

(LSB)

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Table 4-1 3. LOCATE (2Bh) Command Descriptor Block — Field Descriptions

Field Name Description

LUN Logical Unit Number. This field is ignored by t he ta rget , the LUN must be cha nged

within an IDENTIFY me ssa ge.

BT Block Type. This bit indicates how the Block Address field is interpreted.

However, SCSI Logical Block address es are always returned, that is, setting the BT bit does not affe ct the values returned. Th e first re co r ded object (block or Filemark) is at address 0, and Block Addresses count both data blocks and Filemarks.

CP Current Partition. Since multiple partitions are not supported this bit must be set

to 0.

Immed Immediate. If this bit is set to 1, status is returned as soon a s the operation is

started. Otherwise, the status is returned after the operation has completed.

Block Address The Block Address field defines the SCSI Logical Block Address to which the

media will be positioned. These addresses start at 0 and include data blocks and Filemarks.

Partition Not supported. Always set to 0.

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4.7 LOG SELECT Command ( 4Ch)

LOG SELECT allows the host to manage statistical information maintained by the device about its own hardware or the installed media . All type s of parameter values are changeable through LOG SELECT. Read the description of the LOG SENSE command on page 4-32; it provides information about log page format, parameters, and supported pages.

Bit

Byte

0 Operation Code (4Ch) 1 LUN Reserved PCR SP(0) 2 PC Reserved

3 – 6 Reserved

7 (MSB)

9 Unused Reserved Flag Link

7 6 5 4 3 2 1 0

Parameter List Length

(LSB)

Figu r e 4-13. LOG SELECT (4Ch) Command Descriptor Block — Data Format

Table 4-1 4. LOG SELECT (4Ch) Command Descriptor Block — Field Descriptions

Field Name Description

LUN Logical Unit Number. This field is ignored by t he ta rget , the LUN must be cha nged

within an IDENTIFY me ssa ge.

PCR Parameter Code Reset. If this bit is set to 1 and Parameter List Length is 0, all

cummulative va lues of page code 02h and 03h are set to default values, and page 32h values are reset to 0. All threshold values of page code 02h and 03h are also set to defaults. If the PCR is se t to 1 and the Parameter List Length Field is not 0, the command is terminated with a CHECK CONDITION status, with Sense Key of ILLEGAL REQUEST, and ASC of INVALID FIELD IN CDB.

SP Save Page. This bit is not supported and must be set to 0.

If the SP bit is set to 1, the command is terminated with CHECK CONDITION status, with Sense Key of IL LEGAL REQUEST, and ASC of INV ALID FIELD IN CDB.

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Table 4-1 4. LOG SELECT (4Ch) Command Descriptor Block — Field Descriptions (Continued)

Field Name Description

PC Page Control. This field defines the type of parameter values to be selected.

Note: All types of paramete r values are changeable through LOG SELECT.

Code

00b 01b 10b 11b

Type of Parameter Values

Threshold Values Cumu lative Values Default Threshold Values Default Cumulative Values

When the PC field is set to 00b or 01b and the Parameter List Length is 0, the command is terminated wit h a CHECK CONDITION status, with Sense Key of ILLEGAL REQUEST , an d ASC of INVALID FIELD IN CDB. This is because modification of Current Threshold Values and Current Cumulative Values is not supported.

When the PC field is set to 10b and the Parameter List Length field is 0, then all Current Threshol d Values of page code 02h and 03h are reset to their Default Threshold Values. This is equivalent to no change, since Th res hold Values cannot be modified.

When the PC field is set to 11b and the Parameter List Length field is 0, then all Current Cumulative Values of page code 02h and 03h are reset to their Def ault Cumulative Values, and those of page 32h are reset to 0.

Parameter List Length This field spec ifies the length in bytes of the LOG SELECT parameter list to be

transferred from the initiator to the target during the DATA-OUT phase. A parameter list length of 0 indicates that no data is to be transferred. This condition is not considere d an error (see the descriptio n of Param eter Code Reset and Page Control fields elsewher e in this section) . If a parameter list length results in the truncation of any log parameter, the tape drive terminates the command with CHECK CONDITION status, with the Sense Key set to ILLEGAL REQUEST, and ASC of INVALID FIELD IN CDB.

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4.7.1 Error Detection Summary in LOG SELECT CDB

The following conditions constitute errors that the drive detects in relation to the command descriptor block (CDB). The REQUES T SENSE data is set to I LLEGAL REQUEST, INVALID FIELD IN CDB.

• PCR bit is set to 1 and parameter list length is not 0.

• SP bit is set to 1.

• A parameter list length that would c ause a parameter within a valid page to be truncated or

otherwise incompletely initialized.

• A PC value of 00b or 01b and Parameter List Length is 0.

4.7.2 Operation of LOG SELECT

The LOG SELECT command allows the initiator to modify and init ialize parameters within the logs supported by the device.

The two ways to initialize the log param eter s are:

1. By setting the PCR bit in the LOG SELECT CDB, you can immediately clear all parameters of

page codes 02h, 03h, and 32h.

2. Specify the log page and the parameter value as the log parameters can change individual pages.

The following pages can be changed using this method.

Table 4-1 5. LOG SELECT (4Ch) DATA-OUT Phase Codes

Page Code Page Description

02h Write Error Counter Page 03h Read Error Counter Page 32h Compression Ratio Page

NOTE: The Page Control value is ignored for page code 32h. When specifying

log parameters it is assumed that the cumulative values are changed. Furthermore, the setting of parameters 0 and 1 for page code 32h will be ignored. You can set all parameters but 0 and 1.

If multiple pages are sent during this DATA-OUT phase, they must be sent in ascending or der according to page code. Otherwise the command terminates with a CHECK CONDITION status, with the Sense Key set to ILLEGAL REQUEST, and an ASC of INV ALI D FIELD IN PARAMETER LIST.

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The same status is returned if an unsupported Page C ode appears in any header or if the spe cified page cannot be changed.

If any log parameters are changed that affect other initiators, then the target generates a unit attention condition for all init iators except the one that issued the LOG SELECT command. This unit attention condition is return ed with an ASC of LOG PARAMETERS CHANGED.

4.7.3 LOG SELECT Page Format

Each log page begins with a 4-byte header followed by n number of log parameter blocks, one block for each parame te r co de.

Bit

Byte

0 Reserved Page Code 1 Reserved 2 (MSB)

7 6 5 4 3 2 1 0

Page Length

Figu r e 4-14. LOG SELECT Log Page Header — Header Format

Table 4-1 6. LOG SELECT Log Page Header — Field Descriptions

Field Name Description

Page Code The Page Code specifies which Log Page this LOG SELECT command is for. Page Length The Page Length specif ies the total number of bytes contained in this Log Page,

not including the four bytes of the header.

(LSB)

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Bit

Byte

7 6 5 4 3 2 1 0

0 (MSB)

Parameter Code

2 DU DS TSD ETC TMC Rsv’d LP 3 Parameter Length (n – 3) 4 (MSB)

…

Parameter Value

…

Figu r e 4-15. LOG SELECT Log Page Parameters — Data Format

NOTE: Byte 2 of the log paramet er block in Figure 4-15 is commonly re ferred to as the

Parameter Control Byte.

(LSB)

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Table 4-1 7. LOG SELECT Log Parameters — Field Descriptions

Field Name Description

Parameter Code Refer to the LOG SENSE command on page 4-32 for an explanation of the

parameter codes supported for the requested log page. DU Disable Update. I f set to 1, this bit disables parameter counter updates. DS Disable Save. Saving parameters is not supported. Set both DS and TSD to 1. If

either the DS or TSD bits are set t o 0 , th e command is terminated with CHECK

CONDITION status, with the Sens e Key set to ILLEGAL REQUEST, and an ASC

of INVALID FIELD I N PARAMETER LIST. TSD Target Save Disable. Saving parameters is not supported. Set both to 1. If the DS

and/or TSD are set to 0, the command is terminated with CHECK CONDITION

status, with the Sense Key set to IL LEGAL REQUEST, and an ASC of INVAL ID

FIELD IN PARAMETER LIST. ETC Enable Threshold Comparison. When set to 1, the tape drive performs a

comparison with threshold values after the cumulative value is updated.

Comparison criteria are defined in TMC. If the comparison is met and the RLEC

bit of MODE SELECT/SENSE Control Page is set to 1, then a ATTENTION is

generated for all initiators. The ASC is set to LOG EXCEPTION and the ASCQ is

set to THRESHOLD CONDITION MET. If the RLEC bit is 0 and the comparison

is met, then the ATTENTION is not generated. TMC Threshold Met Criteria. See Table4-20 on page 4-37 for the list of criteria. After

the specified criteria in this field is met, the ETC bit is set to 1, the RLEC bit in the

MODE SENSE/SELECT Control P age is set to 1, and ATTENTION is generated

for all initiators. If the RLEC bit is 0 and the comparison is met, then the

ATTENTION is not generated. LP List Paramet er. This bit should always be set to 0, indicating that parameter code s

are treated as data counters. Parameter Length This field specifies the number of bytes of the parame ter value. Parameter Value This field is the ac tual value of this log parameter.

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4.7.4 Error Detection Summary in LOG SELECT Pages

The host should issue a LOG SENSE command to initialize host -re sident software, which allows:

• Correct determinat ion of the pages the tape drive uses.

• Determination of the para meter codes and length of each parameter.

The following conditions constitute errors in the parameter block; they cause the tape drive to return CHECK CONDITION, with the Sense data set to ILLEGAL REQUEST, and the ASC set to INVALID FIELD IN PARAMETER LIST:

• If a page header is received containing unsupported page codes.

• If a reserved field is set.

• Incorrect Log Page length is specified in the page header.

• An illegal parameter code within a valid page c ode.

• Parameter codes for a support ed page are not sent in ascending order .

• Page codes are not sent in ascending order.

• LP bit is set to 1 in the parameter control byte.

• DS bit is set to 0 in the parameter control byte.

• TSD bit is set to 0 in the parameter control byte.

• Parameter length that results in the truncation of parameter value.

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4.8 LOG SENSE Co m ma n d (4Dh)

The LOG SENSE command allows the host to retrieve statistical information the device maintai ns about its own hardware or the installed media. This command complements LOG SELECT.

Bit

Byte

0 Operation Code (4Dh) 1 LUN Reserved PPC SP(0) 2 PC Page Code

3 - 4 Reserved

5 - 6

7 - 8

9 Unused Reserved Flag Link

7 6 5 4 3 2 1 0

(MSB)

Parameter Pointer

(MSB)

Allocation Length

Figu r e 4-16. LOG SENSE (4Dh) Command Descriptor Block — Data Format

(LSB)

Table 4-1 8. LOG SENSE Log Parameters — Field Descriptions

Field Name Description

LUN Logical Unit Number. This field is ignored by t he ta rget , the LUN must be cha nged

within an IDENTIFY me ssa ge. PPC Parameter Poin ter Control. This bit must be set to 0. A PPC bi t of 0 indicates that

the parameter data requested from the device starts with the parameter code

specified in the Parameter Pointer field. It also returns the number of bytes

specified in the Allocation Length field in ascending order of parameter codes

from the specified log page. A PPC bit of 0 and a Parameter Pointer field of 0

cause all available parameter data for that pa ge code to be returned to the initiator.

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Table 4-1 8. LOG SENSE Log Parameters — Field Descriptions (Continued)

Field Name Description

PPC, cont. If the PPC bit is set or the Paramete r Pointer is large r than the highest numbered

parameter on the page, the target terminates the command with CHECK

CONDITION status. The Sense Key is set to ILLEGAL REQUEST, with an

ASC of INVALID FIELD IN CDB.

Note: If the target does not support a param eter code within this page, it does not

return any data associated with this parameter.

SP Parameters Savable (saving log parameters). Not supported, this bi t is always 0.

If the SP bit is set, the command is terminated with CHECK CONDITION status,

with the Sense Key set to ILLEGAL REQUEST, and an ASC of INVALID FIELD

IN CDB. PC Page Control. The PC field defines the type of para meter values to be returned.

These parameter type s are only relevant for page codes 02h and 03h. For all other

page codes the page control field is ignored with in the CDB.

00b 01b 10b 11b

Type of Parameter V alues

Threshold Values Cumu lative Values Default Threshold Values Default Cumulative Values

The Default Threshold Values are the maximum values that each par ameter can

attain.

The Curr en t Cumulative Valu es are the values computed since t he last reset o f th e

device (either by power cycling, BUS DEVICE RESET, or SCSI BUS RESET).

The Defaul t Cumulative Values are th e values to which eac h p arameter is

initialized on a reset condition, as described previously.

By default, Current Threshold Values = Default Threshold Values.

Note: All types of paramete r values are changeable through LOG SELECT. Page Code Page Code. This field identifies which log page the initiator is requesting. If the

page is not supported, the command terminates with a CHECK CONDITION

status, with the Sense Key set to IL LEGAL REQUEST, and an ASC of INVAL ID

FIELD IN CDB. Supported pages are as follows:

Page Code

00h 02h 03h 07h

2Eh

32h 33h

3Eh

Page Description

List of Supported Pages P age Write Error Counter Page Read Error Counter Page Last n Errors Events Page TapeAlert Log Page Compression Ratio Page Device Wellness Log Page Device Stat us Log Page

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Table 4-1 8. LOG SENSE Log Parameters — Field Descriptions (Continued)

Field Name Description

Parameter Pointer Parameter Pointer. This field allows the host to specify at which parameter within a

log page the reques ted data should begin. For example, if a page supports

parameters 0 through 5, and the Parameter Pointer field contains 3, the target

returns only parameters 3, 4, and 5 to the initiator. Similarly, if a page supports

parameters 1, 3, and 6, and th e Paramet er P ointer field cont ains 2, th e tar get ret urns

only parameters 3 and 6 to the initiator.

If Parameter Pointer is larg er than the highest n umbered pa rameter on the page, th e

target t erminates the command with CHECK CONDITION status. The Sense Key

is set to ILLEGAL REQUEST and the ASC is set to INVALID FIELD IN CDB.

Note: Parameter s wit h in a pa g e ar e al w ay s r et u r ne d in as cending or de r acc or d i ng

to parameter code. Allocation Length Allocation L ength. This field is used to inform the target how much space the

initia tor h as al locat ed for da ta. An Allo ca tio n Lengt h of 0 means t hat the tape driv e

returns no Log Sense data. This is not considered an error and GOOD status is

returned.

4.8.1 Error Detection Summary in LOG SENSE CDB

The following conditions c onstitute errors that the tape drive det ects in relati on to the CDB. The Sense data is set to ILLEGAL REQUEST, INVALID FIELD IN CDB.

• If a page is not supported.

• If the parameter pointer is larger than the highest numbered parameter on the page.

• If the SP bit is set to 1.

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4.8.2 Supported Pages LOG SENSE Page (00h)

When the host requests Page 00h, the tape drive returns the 4-byte page header followed by the pages supported in ascending order, one byte for each.

Bit

Byte

0 Reserved Page Code (00h) 1 Reserved

2 - 3

4 00h 5 02h 6 03h 7 07h 8 2Eh

9 32h 10 33h 11 3Eh

7 6 5 4 3 2 1 0

(MSB)

Page Length (08h)

(LSB)

Figu r e 4-17. Supported Pages LOG SENSE Page — Data Format

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4.8.3 Read / Write Error LOG SENSE Page (Pages 02h and 03h)

Each log page begins with a 4-byte header followed by n number of log parameter blocks, with each block containing 8 bytes except f or parameter code 05h. The log parameter block for the parameter total bytes processe d (05h) is 12 bytes, since the parameter value is 8 bytes long.

Figure 4-18 shows the header format of the Read/W rite Error LOG SENSE page (02h or 03h).

Bit

Byte

0 Reserved P age Code (02h or 03h) 1 Reserved

2 - 3

7 6 5 4 3 2 1 0

(MSB)

Page Length

(LSB)

Figu r e 4-18. Read/Write Error LOG SENSE Page Header — Header Format

Table 4-1 9. Read/Write Error LOG SENSE Page Header — Field Descriptions

Field Name Description

Page Code The Page Code echoes the page code that was specified in the LOG SENSE CDB. Page Length The Page Length specifies the total number of bytes contai ned in this log page , not

including the four bytes of the header. For example, if the PPC bit is 0 and Parameter Pointer is 0, the target returns

4 bytes of page header , with page length of 03Ch, followed by 8 bytes of log parameter data for each parameter code, except for parameter code 05h. For code 05h, it returns 12 bytes.

For parameter codes 00h, 01h, 02h, 03h, 04h, and 06h, each log parameter is 8 bytes. For log parameter code 05h, each log parameter is 12 bytes.

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Figure 4-19 shows the parameter format of the Read/Write Error LOG SENSE Page (02h or 03h).

Bit

Byte

7 6 5 4 3 2 1 0

(MSB)

0 - 1

Parameter Code

(LSB)

2 DU DS TSD ETC TMC Rsv’d LP 3 Parameter Length

(MSB)

4 - 7

Parameter Value

(LSB)

Figu r e 4-19. Read/Write Error LOG SENSE Page — Data Format

Table 4-2 0. Read/Write Error LOG SENSE Page Parameters — Field Descriptions

Field Name Description

Parameter Code The following parameter codes are supported for the Read/Write Error log pages:

Parameter Code

00h 01h 02h 03h 04h 05h 06h

Description

Errors corrected with substantial dela ys Errors correcte d with possible delays Total rewrites or rereads Total errors corrected Total times correct ion algorithm processed Total bytes processed Total uncorrected errors

DU Disable Update. A value of 0 indicates that the target updates all log parameter

values. A value of 1 indi ca tes that the target does not update the log paramet er values except in response to LOG SELECT. The tape drive sets this bit when accumula ted values reach maximum. The host also returns this bit set if the host set the bit in the last LOG SELECT command. The default is 0.

Note: For parameter types other than threshold and cumulative values, the DU bit is always 0.

DS Disable Save. Sinc e the tape drive does not support saving parameters, this bit is

always set to 1.

TSD Target Save Disable. Since the tape drive does not support saving parameters, this

bit is always set to 1.

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Table 4-2 0. Read/Write Error LOG SENSE Page Parameters — Field Descriptions (Continued)

Field Name Description

ETC Enable Threshold Comparison. ET C of 1 indicates that a comparison to threshold

is performed. ETC of 0 indicates that this comparison is not performed. This bit is set to 1 by the LOG SELECT co mmand. Default is 0.

TMC Threshold Met Criteria. This field is va lid only if the host sets ETC to 1. It

determines the basis for comparison and the host sp ecifies it by LOG SELECT. If the result of comparison is true (cumul ative = threshold) and the MODE SELECT/ SENSE Control Mode page RLE C bit is set 1, a UNIT ATTENTION is generated for all init iators. The Sense Key is set to UNIT ATTENTION, ASC is set to LOG EXCEP TION, and ASCQ is set to THRESHOLD CONDITION MET. If the RLEC bit in the Control Mode page is 0, the UNIT ATTENTION is not generated.

Note: This comparison is performed in real time. You do not need to issue a LOG SENSE command to get the check c ondition. Once ETC is selected and the RLEC bit in the Control Mode page is set to 1, the drive issues a CHECK CONDITION based on the criteria defi ned in the TMC bits—i f the criteria is me t in r eal time. The check condition does not identify the parameter code for which the criteria is met. The host must iss ue a LOG SENSE command to rea d the counters to see the parameter code for which criteria has been met.

Code

00b 01b 10b 11b

Basis of Comparison

Every update of the cum ulative value Cumu lative value equal to th r e s hold val u e Cumulative value not equal to threshol d value Cumulative value greater than threshold value

LP List Parameter. This bit is always set to 0; the tape drive treats the parameter codes

as data counter. When the data c ounter reaches i ts defined maximum value, it does not incremen t and the DU bit is set to 1. If the data counter is at or reaches its maximum value during the execution of a command, the tape drive completes the command. If the RLEC bit of the Cont rol Mode page is s et to 1, th e tape dri ve then issues the status of CHECK CONDITION and sets th e Sense Key to RECOVERED ERROR with additio nal sense code set to LOG COUNTER AT

MAXIMUM. Parameter Length This field specifies the number of bytes of the parame ter value. Parameter Value This field is the ac tual value of this log parameter.

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4.8.4 Last n Error Events LOG SENSE Page (07h)

This page returns one para meter at a time that consists of the ASCII text for the specified event log. A maximum of 30 log events are stored at a given time in the EEPROM. The Parameter Point er fi eld in the command descriptor bloc k specifies with which parameter code the requested data should begin.

Figure 4-20 shows the header format of the Last n Error Events LOG SENSE Page (07h).

Bit

Byte

0 Reserved Page Code (07h) 1 Reserved

2 - 3

7 6 5 4 3 2 1 0

(MSB)

Page Length

(LSB)

Figu r e 4-20. Last n Error Events LOG SENSE Page Header — Header Format

Table 4-2 1. Last n Error Events LOG SENSE Page Header — Field Descriptions

Field Name Description

Page Code The page code echoes the page code that was specified in the LOG SENSE

command descript or block. Page Length The page length specif ies the total number of bytes contained in this log page, not

including the four bytes of the header.

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Figure 4-21 shows the pa ram et er format of the Last n Error Ev en ts LOG SE N SE Page (07h).

Bit

Byte

7 6 5 4 3 2 1 0

(MSB)

0 - 1

Parameter Code

(LSB)

2 DU DS TSD ETC TMC Rsv’d LP 3 Parameter Length

(MSB)

4 - n

Parameter Code

(LSB)

Figu r e 4-21. Last n Error Events LOG SENSE Page Parameters — Data Format

Table 4-2 2. Log Parameters for Last n Error Events LOG SENSE Page — Field Descriptions

Field Name Description

Parameter Code Parameter code valu es are assigne d from 0 to 29, where 0 is the olde st event sto red

and the highest parameter code returned represents the most recent event. One

parameter code is as signed for e ach l og entry. A Parameter Pointer of 0 in the CDB

returns all the log events stored in the EEPROM. For example, if only 10 log

events are sto red , the n the para m eter co de for th e 10

the parameter pointer field in the CDB contains 0, the target returns paramet er

codes 0 to 9 to the initiator. If the parameter pointer in the CDB contains 20, the

target ret urns the log page header with page length of 0.

event is parameter code 9. If

DU Disable Update. Fo r a list pa rameter, this fie ld is always 0. DS Disable Save. Sinc e the tape drive does not support saving parameters, this bit is

always set to 1. TSD Target Save Disable. Since the tape drive does not support saving parameters, this

bit is always set to 1. ETC Enable Threshold Comparison. For a list parameter, this field is always 0. TMC Threshold Met Criteria. For a list parameter, this field is always 0. LP List Parameter. This bit is always set to 1; the tape drive treats the parameter codes

as list pa rameter s . Parameter Length This field speci fies the num ber of bytes of t he par ameter v alue. T his fi eld i s al ways

set to 0xFC.

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Table 4-2 2. Log Parameters for Last n Error Events LOG SENSE Page — Field Descriptions

Field Name Description

Parameter Code The content of the parameter is an ASCII string that describes the error event. The

text of the parameter includes a “Packet #,” which is a val ue from 0 to 255. This

interna l number is assigned when the packet is writ ten into EEPROM. Zero is

normally the oldest packet, but packet numbers can wrap around from 255 to 0.

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4.8.5 TapeAlert LOG SENSE Page (2Eh)

This page reports al l TapeAlert status flags. Each paramete r is a one-byte flag ind icating the state of all T apeAlert events. Each flag is set to 1 when the corresp onding event occurs. It is the responsibili ty of the host software to exam ine all TapeAlert flags when this page is read as each fl ag is only se t once per occurrence. There are a tota l of 64 one-byte flags, some of which are reserved or not supported by the tape drive.

Figure 4-22 shows the header format of the TapeAlert LOG SENSE Page (2Eh) .

Bit

Byte

0 Reserved Page Code (2Eh) 1 Reserved

2 - 3

7 6 5 4 3 2 1 0

(MSB)

Page Length (140h)

(LSB)

Figu r e 4-22. TapeAlert Log Page LOG SENSE Page Header — Header Format

Table 4-2 3. TapeAlert LOG SENSE Page Header — Field Descriptions

Field Name Description

Page Code The Page Code echoes the page code that was specified in the LOG SENSE CDB. Page Length The Page Length specifies the total number of bytes contai ned in this log page , not

including the four bytes of the header.

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Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

List of Tables

List of Figures

1.1 Purpose and Scope

Chapter 1Intr oduc tion

1.2 Audience

1.3 Related Documents

1.4 Structure of this Manual

1.5 Conventions Used in This Manual

1.6 SCSI Command Descriptions

Chapter 2General SC SI Bu s Operation

2.1 Data Transfer

2.2 Initiator/Target Operation

2.3 SCSI IDs and Logical Unit Numbers (LUNs)

2.4 Unit Attention Condition

2.5 Behavior Around Power-on and SCSI Bus Reset

2.6 Data Cache and Tape Write Interaction

2.7 Other SCSI Functionality

2.8 Bus Phases

2.8.1 ATTENTION Signal Response

2.8.2 STATUS Phase

2.8.3 BUS FREE Phase

2.9 Bus Parity Errors

3.1 SCSI Message System

Chapter 3SC SI Message s

3.2 Supported SCSI Messages

3.2.1 Extended Messages (01h)

3.2.2 Two-Byte Messag e s (2xh)

3.2.3 ABORT Message (06h)

3.2.4 BUS DEVICE RESET Message (0Ch)

3.2.5 COMMAND COMPLETE Message (00h)

3.2.6 DISCONNECT Message (04h)

3.2.7 IDENTIFY Message (80h–FFh)

3.2.8 IGNORE WIDE RESIDUE Message (23h)

3.2.9 INITIATOR DETECTED ERROR Message (05h)

3.2.10 LINKED COMMAND COMPLETE Message (0Ah)

3.2.12 MESSAGE PARITY ERROR Message (09h)

3.2.13 MESSAGE REJECT Message (07h)

3.2.14 NO OPERATION Message (08h)

3.2.15 PARALLEL PROTOCOL REQUEST (Extended Message 04h)

3.2.16 RESTORE POINTERS Message (03h)

3.2.17 SAVE DATA POINTER Message (02h)

3.2.18 SYNCH RON OUS DATA TRANSFER REQUEST (Extended Message 01h)

3.2.19 WIDE DATA TRANSFER REQUEST (Extended Message 03h)

Chapter 4SCSI Commands

4.1 Control Byte — Flag and Link Bits

4.2 Summary of Supported Sequential-access Device Commands

4.3 ERASE Command (19h)

4.4 INQUIRY Command (12h)

4.4.1 Standard INQUIRY Data

Vendor Unique Bytes

4.4.2 Vital Product Data Pages

Supported Vital Product Data Page (00h)

Unit Serial Number Page (80h)

Device Identification Page (83h)

Firmware Build Information Page (C0h)

Subsystem Components Revision Page (C1h)

4.4.3 Command Support Data

4.5 LOAD/UNLOAD Command (1Bh)

4.6 L O CATE Command (2Bh)

4.7 LOG SELECT Command ( 4Ch)

4.7.1 Error Detection Summary in LOG SELECT CDB

4.7.2 Operation of LOG SELECT

4.7.3 LOG SELECT Page Format

4.7.4 Error Detection Summary in LOG SELECT Pages

4.8 LOG SENSE Co m ma n d (4Dh)

4.8.1 Error Detection Summary in LOG SENSE CDB

4.8.2 Supported Pages LOG SENSE Page (00h)

4.8.3 Read / Write Error LOG SENSE Page (Pages 02h and 03h)

4.8.4 Last n Error Events LOG SENSE Page (07h)

4.8.5 TapeAlert LOG SENSE Page (2Eh)