Quantum DPM5500 User's Guide

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Quantum DX-Series Software Interface Guide, 81-81495-01 A01, November 2005, Made in USA.

Quantum Corporation provides this publication “as is” without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability or fitness for a particular purpose. Quantum Corporation may revise this publication from time to time without notice.

Your right to copy this manual is limited by copyright law. Making copies or adaptations without prior written authorization of Quantum Corporation is prohibited by law and constitutes a punishable violation of the law.

TRADEMARK STATEMENT

DLT, SDLT, DLTtape III, DLTtape IV and Super DLTtape I are all trademarks of Quantum Corporation. Other trademarks may be mentioned herein which belong to other companies.

Preface xxi

Chapter 1 Theory of Operation 1

Enhanced Data Protection Overview..............................................................1

SCSI-2 Implementation Philosophy ................................................................2

Medium Changer Elements.............................................................................. 2

Medium Transport Element...................................................................... 3

Storage Elements and Data Transfer ELements.....................................3

Events................................................................................................................... 5

Power Cycle................................................................................................. 5

DX-Series Unit On-Line Initialization Failure ........................................ 5

Operational Sequences......................................................................................6

Power-On ..................................................................................................... 6

On-Line Initialization................................................................................. 6

DX-Series Unit Inventory .......................................................................... 7

Off-Line ........................................................................................................8

Typical Application Enhancements ......................................................... 8

Chapter 2 Emulated Medium Changer SCSI Commands 9

Supported Operational Commands.............................................................. 11

Quantum DX-Series Software Interface Guide iii

Initialize Element Status (07h)........................................................................13

Initialize Element Status with Range (E7h) ..................................................14

Inquiry (12h)......................................................................................................16

Inquiry Command Data Format .............................................................16

Standard Inquiry Data Format................................................................17

Supported Vital Product Data Page .......................................................20

Log Sense (4Dh)................................................................................................26

Mode Select (15h) .............................................................................................32

Mode Sense (1Ah) ............................................................................................39

Move Medium (A5h) .......................................................................................50

Position To Element (2Bh)...............................................................................52

Read Element Status (B8h)..............................................................................54

Release (17h)......................................................................................................71

Report LUNS (A0h)..........................................................................................73

Request Sense (03h)..........................................................................................75

Request Volume Element Address (B5h)......................................................79

Reserve (16h).....................................................................................................95

Rezero Unit (01h)..............................................................................................99

Send Diagnostic (1Dh) ...................................................................................100

Send Volume Tag (B6h).................................................................................102

Test Unit Ready (00h) ....................................................................................105

Chapter 3 Emulated DLT7000 SCSI Commands 107

Overview of Command and Status Processing .........................................108

SCSI Pointers............................................................................................109

Reset Sequence.........................................................................................110

Status/Error Reporting ..........................................................................113

DATA-Phase Command Components.................................................115

Unit Attention Condition.......................................................................118

Behavior at Power-On and SCSI Bus Reset.........................................118

Data Cache and Tape Write Interaction...............................................119

SCSI Command Descriptions .......................................................................120

Erase (19h) .......................................................................................................122

Inquiry (12h)....................................................................................................124

Standard Inquiry Data Page ..................................................................126

Vendor Unique Inquiry Data ................................................................129

Supported Vital Product Data Page .....................................................132

Load Unload (1Bh) .........................................................................................142

Locate (2Bh).....................................................................................................147

Log Select (4Ch)..............................................................................................149

iv Quantum DX-Series Software Interface Guide

Log Detection Summary in LOG SELECT Command

Descriptor Block............................................................................... 152

Operation of LOG SELECT ................................................................... 152

Log Select Page Format..........................................................................153

Error Detection Summary in LOG SELECT Pages ............................157

Log Sense (4Dh).............................................................................................. 158

Error Detection Summary in LOG SENSE Command

Descriptor Block............................................................................... 161

Supported Pages Log Page (Page 00h) ................................................ 162

Read Error Counter Page (Page 03h) ................................................... 162

Last n Error Events Page (07h)..............................................................162

TapeAlert Page (2Eh) ............................................................................. 162

Read / Write Compression Page (32h)................................................ 166

Device Wellness Page (33h)................................................................... 171

Device Status Page (3Eh) ....................................................................... 171

Mode Select (6 /10) (15h / 55h) ................................................................... 172

Mode Parameter List .............................................................................. 174

READ / WRITE Error Recovery Page (01h) ....................................... 181

Disconnect/Reconnect Page (02h)........................................................ 183

Control Mode Page (0Ah)...................................................................... 185

Data Compression Page (0Fh)...............................................................188

Device Configuration Page (10h)..........................................................190

Medium Partition Page (11h)................................................................ 194

TapeAlert Page (1Ch) ............................................................................. 196

EEPROM Vendor Unique Page (3Eh).................................................. 200

Changeable Parameters within MODE SELECT................................ 200

Mode Sense (6/10) (1Ah / 5Ah) .................................................................. 202

MODE SENSE Data Headers ................................................................ 204

MODE SENSE Block Descriptor........................................................... 206

MODE SENSE Mode Pages................................................................... 209

Prevent / Allow Medium Removal (1Eh).................................................. 227

Read (08h) ....................................................................................................... 229

Read Block Limits (05h) ................................................................................ 232

Read Buffer (3Ch)........................................................................................... 234

Combined Header and Data Mode...................................................... 236

Data Mode................................................................................................237

Descriptor Mode ..................................................................................... 237

Read Position (34h)........................................................................................238

Receive Diagnostic Results (1Ch) ................................................................ 241

Release Unit (17h) .......................................................................................... 243

Media Changer Considerations............................................................ 244

Report LUNS (A0h) ....................................................................................... 245

Request Sense (03h) ....................................................................................... 247

Quantum DX-Series Software Interface Guide v

Reserve Unit (16h)..........................................................................................254

Rewind (01h) ...................................................................................................257

Send Diagnostic (1Dh) ...................................................................................258

Space (11h).......................................................................................................265

Test Unit Ready (00h) ....................................................................................268

Verify (13h)......................................................................................................269

Write (0Ah)......................................................................................................271

Exception Conditions .............................................................................272

Write Buffer (3Bh) ..........................................................................................274

Write Combined Header and Data Mode (000b)................................275

Write Data Mode (010b) .........................................................................275

Download Microcode Mode (100b)......................................................276

Download Microcode and Save Mode (101b).....................................276

Write Filemarks (10h) ....................................................................................277

Appendix A Sense Key Values 279

Appendix B Media Changer Sense Code Values 281

Appendix C DLT7000 Sense Code Values 289

Appendix D Fibre Channel Topology 297

Fibre Channel Topology.........................................................................297

Fibre Channel Addressing.....................................................................298

Appendix E DX-Series Software Deviations 301

Media Changer SCSI Command Deviations.......................................301

DLT 7000 SCSI Command Deviations .................................................306

Glossary 313

vi Quantum DX-Series Software Interface Guide

Index 317

Quantum DX-Series Software Interface Guide vii

viii Quantum DX-Series Software Interface Guide

Figures

Figure 1 Read Element Status Data General Structure......................... 57

Figure 2 Request Volume Element Address Data................................. 82

Figure 3 Fibre Channel Topologies ....................................................... 298

Quantum DX-Series Software Interface Guide ix

Figures

x Quantum DX-Series Software Interface Guide

Tables

Table 1 DX30 Storage Elements ...............................................................3

Table 2 DX100 Storage Elements .............................................................3

Table 3 DX3000 Storage Elements ........................................................... 4

Table 4 DX5000 Storage Elements ........................................................... 4

Table 5 SCSI-2 Terms.................................................................................9

Table 6 Supported Operational Commands ........................................ 11

Table 7 Initialize Element Status Command........................................ 13

Table 8 Initialize Element Status with Range Command................... 14

Table 9 Inquiry Command Data Format .............................................. 16

Table 10 Standard Inquiry Data............................................................... 17

Table 11 Supported Vital Product Data Page......................................... 20

Table 12 Unit Serial Number Page (Page 80h)....................................... 21

Table 13 Device Identification VPD Page 83h........................................ 22

Table 14 Identification Descriptor ...........................................................22

Table 15 Code Set....................................................................................... 23

Table 16 Association.................................................................................. 23

Table 17 Identifier Type ............................................................................ 24

Quantum DX-Series Software Interface Guide xi

Tables

Table 18 Device Identification VPD Logical Unit..................................24

Table 19 Device Identification VPD World Wide Name ......................25

Table 20 Log Sense Command..................................................................26

Table 21 Supported Log Page...................................................................28

Table 22 Medium Changer Statistics Page..............................................28

Table 23 Log Parameter.............................................................................29

Table 24 Supported Log Parameter Codes for 30h Page ......................30

Table 25 Mode Select Command..............................................................32

Table 26 Mode Select Data - Vendor Unique Page 20h.........................33

Table 27 Mode Select Data - Vendor Unique Page 00h.........................34

Table 28 Mode Select Data - Element Address Assign. Page...............35

Table 29 Changeable Parameters within MODE SELECT....................37

Table 30 Mode Sense Command..............................................................40

Table 31 Mode Sense Data Header ..........................................................41

Table 32 Mode Sense Data - Vendor Unique Page 00h.........................42

Table 33 Mode Sense Data - Element Address Assign. Page...............43

Table 34 Mode Sense Data - Trans. Geometry Para. Page....................46

Table 35 Mode Sense Data - Device Capabilities Data..........................47

Table 36 Mode Sense Data - Vendor Unique Page 20h.........................48

Table 37 Move Medium Command.........................................................50

Table 38 Position To Element Command................................................52

Table 39 Read Element Status Command...............................................54

Table 40 Read Element Status Data .........................................................58

Table 41 Element Status Page ...................................................................59

Table 42 Medium Transport Element Descriptor ..................................60

Table 43 Primary Volume Tag Information............................................62

Table 44 Storage Element Descriptor.......................................................62

Table 45 Import/Export Element Descriptor.........................................64

Table 46 Data Transfer Element Descriptor............................................67

xii Quantum DX-Series Software Interface Guide

Tables

Table 47 Alternate Volume Tag Information ......................................... 69

Table 48 Release Command...................................................................... 71

Table 49 Report LUNS Command........................................................... 73

Table 50 LUN Reporting Parameter List ................................................74

Table 51 Request Sense Command.......................................................... 75

Table 52 Request Sense Data .................................................................... 76

Table 53 Request Volume Element Address Command ...................... 79

Table 54 Volume Element Address Header ........................................... 83

Table 55 Element Status Page................................................................... 84

Table 56 Medium Transport Element Descriptor.................................. 85

Table 57 Primary Volume Tag Information ........................................... 87

Table 58 Alternate Volume Tag Information ......................................... 87

Table 59 Storage Element Descriptor ...................................................... 87

Table 60 Import/Export Element Descriptor......................................... 90

Table 61 Data Transfer Element Descriptor ........................................... 92

Table 62 Reserve Command.....................................................................96

Table 63 Element List Descriptor............................................................. 97

Table 64 Rezero Unit Command.............................................................. 99

Table 65 Send Diagnostic Command .................................................... 100

Table 66 Selftest Bit Definition............................................................... 101

Table 67 Send Volume Tag Command ................................................. 102

Table 68 Send Volume Tag Parameters ................................................ 103

Table 69 Test Unit Ready Command .................................................... 105

Table 70 Supported SCSI Commands...................................................108

Table 71 Command Descriptor Block Fields........................................ 110

Table 72 Command Descriptor Block - Field Descriptions................ 111

Table 73 Command Descriptor Block Control Field - Data Format . 112

Table 74 Command Descriptor Block Control Field -

Field Descriptions.....................................................................113

Quantum DX-Series Software Interface Guide xiii

Tables

Table 75 Status Codes ..............................................................................114

Table 76 DATA-Phase Command Contents.........................................116

Table 77 ERASE COMMAND Descriptor Block - Data Format ........122

Table 78 INQUIRY Command Descriptor Block - Data Format........124

Table 79 INQUIRY Command Descriptor Block -

Field Descriptions .....................................................................125

Table 80 Vital Product Data - Page Codes............................................126

Table 81 Inquiry Command (12h)..........................................................126

Table 82 Standard Inquiry Data Page - Field Descriptions ................127

Table 83 INQUIRY Vendor Unique Bytes Definitions........................129

Table 84 Vendor Unique Inquiry Data Page - Field Descriptions.....131

Table 85 Supported Vital Product Data Pages Page - Data Format ..133

Table 86 Unit Serial Number Page (80h) - Data Format .....................133

Table 87 Unit Serial Number Page - Field Descriptions ....................134

Table 88 Device Identification VPD Page 83h......................................134

Table 89 Identification Descriptor..........................................................135

Table 90 Code Set......................................................................................135

Table 91 Association.................................................................................136

Table 92 Identifier Type...........................................................................136

Table 93 Device Identification VPD Logical Unit................................137

Table 94 Device Identification VPD World Wide Name ....................137

Table 95 Firmware Build Information Page (C0h) - Data Format.....138

Table 96 Firmware Build Information Page (C0h) -

Field Descriptions .....................................................................138

Table 97 Subsystem Components Revision Page (C1h) -

Data Format ...............................................................................138

Table 98 Subsystem Components Revision Page -

Field Descriptions .....................................................................140

Table 99 LOAD UNLOAD Command Descriptor Block -

Data Format ...............................................................................144

xiv Quantum DX-Series Software Interface Guide

Tables

Table 100 LOAD UNLOAD Command Descriptor Block -

Field Descriptions.....................................................................144

Table 101 LOCATE Command Descriptor Block - Data Format......... 147

Table 102 LOCATE Command Descriptor Block -

Field Descriptions.....................................................................148

Table 103 LOG SELECT Command Descriptor Block - Data Format. 149

Table 104 LOG SELECT Command Descriptor Block -

Field Descriptions.....................................................................150

Table 105 LOG SELECT Log Page Header Format............................... 153

Table 106 LOG SELECT Log Page Header Field Descriptions............ 153

Table 107 LOG SELECT Log Parameters Format..................................154

Table 108 LOG SELECT Log Parameters Field Descriptions .............. 154

Table 109 LOG SENSE Command Descriptor Block - Data Format ... 158

Table 110 LOG SENSE Command Descriptor Block -

Field Descriptions.....................................................................159

Table 111 LOG SENSE Command Descriptor Block ............................ 160

Table 112 Supported Pages Page - Data Format.................................... 162

Table 113 TapeAlert LOG SENSE Header Format................................ 163

Table 114 TapeAlert LOG SENSE Header Field Descriptions............. 163

Table 115 TapeAlert Page Log Parameters Format...............................164

Table 116 TapeAlert Page Log Parameter Field Descriptions ............. 164

Table 117 TapeAlert Flags, Severity Levels, and Meanings................. 165

Table 118 Read / Write Compression Ratio LOG SENSE Header

Format........................................................................................ 166

Table 119 Read / Write Compression Ratio LOG SENSE Header

Field Descriptions.....................................................................167

Table 120 Log Parameters Format for Read / Write Compression Ratio

LOG SENSE Page (Parameter Codes 00h and 01h)............. 167

Table 121 Log Parameters for Read / Write Compression Ratio LOG

SENSE Page Field Descriptions (Parameter Codes 00h

and 01h) .....................................................................................168

Quantum DX-Series Software Interface Guide xv

Tables

Table 122 Log Parameters Format for Read / Write Compression Ratio

LOG SENSE Page (Parameter Codes 02h through 09h)......169

Table 123 Log Parameters for Read / Write Compression Ratio LOG

SENSE Page Field Descriptions (Parameter Codes 02h

through 09h) ..............................................................................170

Table 124 Mode Select (6) Command Descriptor Block -

Data Format ...............................................................................173

Table 125 Mode Select (10) Command Descriptor Block -

Data Format ...............................................................................173

Table 126 MODE SELECT (6)/(10) Command Descriptor Block -

Field Descriptions .....................................................................174

Table 127 MODE SELECT (6) Mode Parameter List - Data Format....174

Table 128 MODE SELECT (10) Mode Parameter List - Data Format..174

Table 129 MODE SELECT Mode Parameter List -

Field Descriptions .....................................................................175

Table 130 MODE SELECT (6) Mode Parameter Header -

Data Format ...............................................................................175

Table 131 MODE SELECT (10) Mode Parameter Header -

Data Format ...............................................................................176

Table 132 MODE SELECT Mode Parameter Header -

Field Descriptions .....................................................................177

Table 133 MODE SELECT Mode Parameter Block Descriptor -

Data Format ...............................................................................178

Table 134 MODE SELECT Mode Parameter Block Descriptor -

Field Descriptions .....................................................................178

Table 135 MODE SELECT Page Descriptor - Data Format ..................180

Table 136 MODE SELECT Page Descriptor - Field Descriptions ........ 181

Table 137 Error Recovery Page - Data Format .......................................181

Table 138 Error Recovery Page - Field Descriptions .............................182

Table 139 Disconnect / Reconnect Page - Data Format........................183

Table 140 Disconnect / Reconnect Page - Field Descriptions ..............184

Table 141 Control Mode Page Format Descriptor - Data Format........186

Table 142 Control Mode Page Descriptor - Field Descriptions............186

xvi Quantum DX-Series Software Interface Guide

Tables

Table 143 Data Compression Page Format Descriptor - Data Format188

Table 144 Data Compression Page Descriptor - Field Descriptions... 189

Table 145 Device Configuration Page - Data Format............................190

Table 146 Device Configuration Page - Field Descriptions..................192

Table 147 Medium Partition Page Format Descriptor - Data Format. 195

Table 148 Medium Partition Page Descriptor - Field Descriptions .... 195

Table 149 TapeAlert Page Format Descriptor - Data Format ..............196

Table 150 TapeAlert Page Format Descriptor - Field Descriptions .... 197

Table 151 Changeable Parameters within MODE SELECT .................200

Table 152 MODE SENSE (6) Command Descriptor Block -

Data Format...............................................................................202

Table 153 MODE SENSE (10) Command Descriptor Block -

Data Format...............................................................................203

Table 154 MODE SENSE Control Descriptor Block -

Field Descriptions.....................................................................203

Table 155 MODE SENSE (6) Data Header - Data Format ....................204

Table 156 MODE SENSE (10) Data Header - Data Format .................. 205

Table 157 MODE SENSE Data Header - Field Descriptions................ 205

Table 158 MODE SENSE Block Descriptor - Data Format................... 206

Table 159 MODE SENSE Block Descriptor - Field Descriptions......... 207

Table 160 MODE SENSE Page Descriptor - Data Format .................... 209

Table 161 MODE SENSE Page Descriptor - Field Descriptions .......... 210

Table 162 Read / Write Error Recovery Page - Data Format .............. 211

Table 163 Read / Write Error Recovery Page - Field Descriptions ....212

Table 164 Disconnect / Reconnect Page - Data Format........................ 213

Table 165 Disconnect / Reconnect Page - Field Descriptions.............. 214

Table 166 Control Mode Page - Data Format......................................... 215

Table 167 Control Mode Page - Field Descriptions............................... 216

Table 168 Data Compression Page - Data Format................................. 217

Table 169 Data Compression Page - Field Descriptions....................... 217

Quantum DX-Series Software Interface Guide xvii

Tables

Table 170 Device Configuration Page - Data Format............................219

Table 171 Device Configuration Page - Field Descriptions..................220

Table 172 Medium Partition Page - Data Format ..................................222

Table 173 Medium Partition Page - Field Descriptions ........................223

Table 174 TapeAlert Page Format Descriptor - Data Format...............224

Table 175 TapeAlert Page Format Descriptor - Field Descriptions.....224

Table 176 PREVENT / ALLOW MEDIUM REMOVAL Command

Descriptor Block - Data Format ..............................................227

Table 177 PREVENT / ALLOW MEDIUM REMOVAL Command

Descriptor Block - Field Descriptions ....................................228

Table 178 READ Command Descriptor Block - Data Format..............229

Table 179 READ Command Descriptor Block - Field Descriptions....230

Table 180 READ BLOCK LIMITS Command Descriptor Block -

Data Format ...............................................................................232

Table 181 READ BLOCK LIMITS Data - Data Format..........................232

Table 182 READ BLOCK LIMITS Data - Field Descriptions................233

Table 183 READ BUFFER Command Descriptor Block -

Data Format ...............................................................................234

Table 184 READ BUFFER Command Descriptor Block -

Field Descriptions .....................................................................235

Table 185 READ BUFFER Header - Data Format. .................................236

Table 186 READ BUFFER Header - Field Descriptions ........................237

Table 187 READ BUFFER Descriptor - Data Format.............................237

Table 188 READ POSITION Command Descriptor Block -

Data Format ...............................................................................238

Table 189 READ POSITION Command Descriptor Block -

Field Descriptions .....................................................................238

Table 190 READ POSITION - Data Format ............................................239

Table 191 READ POSITION Data - Field Descriptions.........................240

Table 192 RECEIVE DIAGNOSTIC RESULTS Command Descriptor

Block - Data Format..................................................................241

xviii Quantum DX-Series Software Interface Guide

Tables

Table 193 RECEIVE DIAGNOSTIC RESULTS Command Data -

Field Descriptions.....................................................................241

Table 194 RECEIVE DIAGNOSTIC RESULTS - Data Format............. 242

Table 195 RELEASE UNIT Command Descriptor Block -

Data Format...............................................................................243

Table 196 RELEASE UNIT Command Data - Field Descriptions ....... 243

Table 197 Report Luns Command ........................................................... 245

Table 198 LUN Reporting Parameter List .............................................. 246

Table 199 REQUEST SENSE Command Descriptor Block -

Data Format...............................................................................247

Table 200 REQUEST SENSE Command Data - Field Descriptions .... 247

Table 201 REQUEST SENSE - Data Format............................................ 248

Table 202 REQUEST SENSE Data - Field Descriptions........................ 249

Table 203 Supported Sense Keys ............................................................ 252

Table 204 RESERVE UNIT Command Descriptor Block -

Data Format...............................................................................254

Table 205 RESERVE UNIT Command Data - Field Descriptions ....... 254

Table 206 REWIND Command Descriptor Block - Data Format........ 257

Table 207 REWIND Command Data - Field Descriptions ................... 257

Table 208 SEND DIAGNOSTIC Command Descriptor Block -

Data Format...............................................................................258

Table 209 SEND DIAGNOSTIC Command Data -

Field Descriptions.....................................................................258

Table 210 SEND DIAGNOSTIC CDB Bits Selftst, DevOfl,

and UnitOfl................................................................................ 260

Table 211 SEND DIAGNOSTIC Parameter List - Data Format........... 261

Table 212 SEND DIAGNOSTIC Parameter List -

Field Descriptions.....................................................................262

Table 213 Sense Keys Used for SEND DIAGNOSTIC .......................... 264

Table 214 ASC / ASCQ for SEND DIAGNOSTIC ................................264

Table 215 SPACE Command Descriptor Block - Data Format............ 265

Table 216 SPACE Command Data - Field Descriptions ....................... 266

Quantum DX-Series Software Interface Guide xix

Tables

Table 217 TEST UNIT READY Command Descriptor Block -

Data Format ...............................................................................268

Table 218 VERIFY Command Descriptor Block - Data Format ...........269

Table 219 VERIFY Command Data - Field Descriptions ......................269

Table 220 WRITE Command Descriptor Block - Data Format ............271

Table 221 WRITE Command Data - Field Descriptions........................272

Table 222 WRITE BUFFER Command Descriptor Block -

Data Format ...............................................................................274

Table 223 WRITE BUFFER Command Data - Field Descriptions .......275

Table 224 WRITE FILEMARKS Command Descriptor Block -

Data Format ...............................................................................277

Table 225 WRITE FILEMARKS Command Data - Field Descriptions277

Table 226 Sense Data Values (Hexadecimal)..........................................279

Table 227 Sense Data Values (Hexadecimal ...........................................282

Table 228 DLT7000 Tape Drive Sense Data Values (Hexadecimal)....290

xx Quantum DX-Series Software Interface Guide

Preface

This guide describes the procedures and issues involved in the development of hierarchical mass storage software applications and utilities to communicate with the Quantum DX-Series enhanced data protection system and this includes the following models:

•DX30

•DX100

•DX3000

•DX5000

Audience This guide is designed for use by software engineers who have a basic

understanding of SCSI principles and technology.

Purpose This document provides information about DX-Series software including:

• Theory of operation

• Software interfaces for both the DX-Series system and the virtual DLT7000 tape drives

• Sense data values

Quantum DX-Series Software Interface Guide xxi

Preface

Document Organization

This guide is organized as follows:

• Chapter 1, “Theory of Operation,” explains medium changer elements, events, operational sequences, configuration, error recovery, system performance, and diagnostic support issues.

• Chapter 2, “Emulated Software Interfaces,” describes SCSI-2 terminology in relation to the DX-Series enhanced data protection system. This includes required and optional SCSI-2 messages, and operational commands.

• Chapter 3, “Emulated DLT7000 SCSI Commands,” describes SCSI terminology in relation to the DLT7000 tape drive. This includes required and optional SCSI-2 messages, and operational commands.

• Appendix A, Sense Key Values provides information on the supported sense keys for request sense.

• Appendix B, Media Changer Sense Code Values provides sense code values for the medium changer.

• Appendix C, DLT7000 Sense Code Values provides sense code values for the DLT7000 tape drive.

• Appendix D, Fibre Channel Topology provides an overview of Fibre Channel topology available with the DX30 and DX100 and as an option with DX3000 and DX5000.

• Appendix E, DX-Series Software Deviations provides an overview of the implemented changes to the DX-Series software.

• This guide concludes with a glossary and an index.

xxii Quantum DX-Series Software Interface Guide

Preface

Notational Conventions

This manual uses the following conventions:

Caution: Cautions indicate potential hazards to equipment and are

included to prevent damage to equipment. Cautions may advise you that failure to take or avoid an action could result in corrupt data or loss of data.

Note: Notes emphasize important information related to the main

topic.

Warning: Warnings indicate potential hazards to personal safety

and are included to prevent injury.

Tech Tip: Tech tips indicate an area that deviates from normal DLT

tape drive or changer behavior.

This manual uses the following:

• All binary numbers are succeeded by “b”

• All hexadecimal numbers are succeeded by “h”

• Error or attention conditions are represented in parenthesis that translate as follows:

(SK=S ASC=AA ASCQ=QQ)

where:

S = hexadecimal sense key value

AA = hexadecimal additional sense code

QQ = hexadecimal additional sense code qualifier

Quantum DX-Series Software Interface Guide xxiii

Preface

1Theory of Operation

This chapter discusses these topics:

• SCSI-2 Implementation Philosophy

• Medium Changer Elements

• Events

• Operational Sequences

Chapter 1

Enhanced Data Protection Overview 1

The Quantum DX-Series system takes advantage of high speed hard drives to greatly reduce the time required for backup/restore functions and also improve confidence in completing the backup in the time allowed.

Quantum DX-Series Software Interface Guide 1

Chapter 1 Theory of Operation SCSI-2 Implementation Philosophy

SCSI-2 Implementation Philosophy 1

Using the SCSI-2 standard, the DX-Series system is designed so that the host can adapt to changes in the configuration. For example, the host can detect a change in the number of virtual tape drives configured in the DXSeries system.

The DX-Series system uses the SCSI-2 medium changer command set. This command set is complete and includes all primitive (elemental) commands required by a host to carry out any required complex operation.

The DX-Series system relies on the host computer to perform complex operations by issuing a sequence of elemental commands in the correct order. The DX-Series system does not execute operations that could result in damage to the device.

Medium Changer Elements 1

The medium changer command set accesses address space for the set of physical locations and mechanisms within the DX-Series system. This guide uses the SCSI-2 term element to refer to one member of the DXSeries system address space.

Each element is a discrete physical entity that can hold a single tape cartridge and is represented by a unique 16-bit element address.

The DX-Series system consists of these medium changer elements:

• Medium transport element

• Storage elements

• Data transfer elements

Issue the Mode Sense command to determine:

• DX-Series system configuration

•First address

• Number of elements of each type (medium transport, storage, or data transfer)

2 Quantum DX-Series Software Interface Guide

Chapter 1 Theory of Operation

Medium Changer Elements

Medium Transport Element

Storage Elements and Data Transfer ELements

Table 1 DX30 Storage Elements

The medium transport element consists of the following component:

• Virtual gripper

This mechanism can hold a single cartridge and is considered to be a single medium transport element. It moves media between elements within the DX-Series system.

The DX-Series system emulation is described in the following tables:

• DX30 Storage Elements

• DX100 Storage Elements

• DX3000 Storage Elements

• DX5000 Storage Elements

DX30 Storage Elements

Virtual tape drives 2 to 30

Virtual tape cartridges 2 to 160 per array (250GB drives),

320 per array(400 GB drives)

Table 2 DX100 Storage Elements

Number of arrays 1 to 4

Total number of virtual cartridges 640 (250GB drives), 1280 (400GB

drives)

DX100 Storage Elements

Virtual tape drives 2 to 55

Virtual tape cartridges 2 to 320 per array (250GB drives),

640 per array (400GB drives)

Quantum DX-Series Software Interface Guide 3

Chapter 1 Theory of Operation Medium Changer Elements

DX100 Storage Elements

Number of arrays 1 to 16

Total number of virtual cartridges 2560 (250GB drives), 5120 (400GB

drives)

Table 3 DX3000 Storage Elements

Table 4 DX5000 Storage Elements

DX3000 Storage Elements

Virtual tape drives 1 to 32

Virtual tape cartridges 1 to 80 per LUN

Number of RAID Sets 1 to 2

Total number of virtual cartridges 1 to 400 per LUN (800 max)

DX5000 Storage Elements

Virtual tape drives 1 to 64

Virtual tape cartridges 1 to 80 per LUN

Number of RAID Sets 1 to 4

Total number of virtual cartridges 1 to 400 per LUN (1600 max)

4 Quantum DX-Series Software Interface Guide

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