Quantum LTO-2 SCSI User Manual

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LTO-2 SCSI Interface Guide, 50004524 Rev. A, September 2006, 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 document 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

Quantum, the Quantum logo, DLT, DLTtape, and the DLTtape logo are registered trademarks of Quantum Corporation in the U.S. and other countries. LTO and Ultrium are trademarks of HP, IBM and Quantum in the U.S. and other countries.

All other trademarks are the property of their respective companies.

Preface xix

Chapter 1 SCSI Interface 1

Overview.............................................................................................................1

ANSI Standards ..........................................................................................1

Cabling and Connectors ............................................................................ 2

General Features ......................................................................................... 2

Parallel SCSI Interface ....................................................................................... 2

General Features ......................................................................................... 2

Disconnect/Reconnect Function .............................................................. 3

SCSI Messages............................................................................................. 4

Inbound Messages ...................................................................................... 5

Outbound Messages................................................................................... 6

Extended Messages ....................................................................................8

Parity Errors................................................................................................. 9

Message Exception Handling ................................................................. 12

Standards Conformance.................................................................................. 15

LTO Conformance ........................................................................................... 17

General Behaviors............................................................................................ 17

Reset Condition......................................................................................... 17

Unit Attention Condition ........................................................................ 17

Contingent Allegiance Condition........................................................... 18

LTO-2 SCSI Interface Guide iii

Contents

Buffered Mode........................................................................................... 18

Immediate Commands............................................................................. 18

Residual Length Function........................................................................ 19

Early Warning Function........................................................................... 19

Error Reporting ......................................................................................... 19

Variable and Fixed Mode Recording ..................................................... 20

Library Features........................................................................................21

Chapter 2 SCSI Commands 24

Command Set ...................................................................................................24

Command Descriptor Blocks ......................................................................... 26

Command Descriptor Block Formats .................................................... 26

Operation Code Format ........................................................................... 28

Control Byte Format.................................................................................29

Command Status..............................................................................................30

ERASE Command............................................................................................ 32

Completion Status .................................................................................... 33

INQUIRY Command.......................................................................................36

Standard Inquiry Data Page.................................................................... 38

Supported Vital Product Data (VPD) Page (00h)................................. 42

Unit Serial Number Page (80h)............................................................... 44

Device Identification Page (83h).............................................................45

Drive Component Revision Levels Pages (C0h, C1h) ......................... 48

Drive Component Serial Number Page (C2, C3, C4, C5, C6h)........... 50

Drive Status Page (DFh)...........................................................................52

Drive State Field Values...........................................................................57

Cartridge Type Field Values ................................................................... 58

Command Support Data.......................................................................... 59

Completion Status .................................................................................... 61

LOAD UNLOAD Command..........................................................................62

Medium Position....................................................................................... 63

Medium Loadable Position ..................................................................... 64

Medium Auxiliary Memory Accessible Position................................. 65

Medium Loaded and Ready Position .................................................... 66

Completion Status .................................................................................... 67

LOCATE Command ........................................................................................69

Completion Status .................................................................................... 71

LOG SELECT Command ................................................................................ 73

Log Pages ................................................................................................... 75

Log Parameters .........................................................................................76

Parameter Control Byte............................................................................ 77

LTO-2 SCSI Interface Guide iv

Contents

Supported Log Pages ............................................................................... 78

Maximum Counts ..................................................................................... 79

Completion Status .................................................................................... 80

LOG SENSE Command................................................................................... 81

Page Control Field .................................................................................... 83

The Parameter Pointer Field.................................................................... 84

Supported Log Pages ............................................................................... 84

Log Page Format ....................................................................................... 85

Supported Log Pages Log Page (00h)....................................................88

Write Error Counters Log Page (02h) .................................................... 91

Read Error Counters Log Page (03h) ..................................................... 92

Sequential Access Device Log Page (0Ch) ............................................93

Device Statistics Log Page (14h) .............................................................94

Tape Diagnostic Data Log Page (16h).................................................... 96

Tape Alert Log Page (2Eh).....................................................................100

Tape Usage Log Page (30h) ................................................................... 111

Tape Capacity Log Page (31h) .............................................................. 112

Data Compression Log Page (32h)....................................................... 113

Error Events Log Page (33h).................................................................. 114

Completion Status ..................................................................................118

MODE SELECT Command ..........................................................................119

6-Byte Command Descriptor Block...................................................... 120

10-Byte Command Descriptor Block.................................................... 121

Parameter List ......................................................................................... 122

6-Byte Parameter Header....................................................................... 123

10-Byte Parameter Header.....................................................................124

Parameter List Block Descriptor........................................................... 126

Mode Parameter Pages .......................................................................... 127

Disconnect/Reconnect Mode Page (02h) ............................................128

Control Mode Page (0Ah)...................................................................... 130

Data Compression Control Mode Page (0Fh)..................................... 133

Sequential Access Device Configuration Mode Page (10h).............. 136

Informational Exceptions Mode Page (1Ch)....................................... 140

Drive Capabilities Control Mode Page (21h)...................................... 142

Interface Control Mode Page (22h) ......................................................145

Completion Status ..................................................................................150

MODE SENSE Command............................................................................. 151

6-Byte Command Descriptor Block...................................................... 151

10-Byte Command Descriptor Block.................................................... 153

Mode Sense Data Format....................................................................... 155

6-Byte Mode Parameter Header .......................................................... 156

10-Byte Mode Parameter Header .........................................................157

Block Descriptor...................................................................................... 159

LTO-2 SCSI Interface Guide v

Contents

Mode Parameter Pages .......................................................................... 160

Completion Status ..................................................................................161

PARK UNPARK Command......................................................................... 162

Completion Status ..................................................................................163

PREVENT ALLOW MEDIUM REMOVAL Command............................ 164

Completion Status ..................................................................................166

READ Command ...........................................................................................167

Command Operation .............................................................................170

End of Data (EOD).................................................................................. 170

Filemark (FM)..........................................................................................170

Transfer Length Satisfied ...................................................................... 171

End of Tape (EOT) or End-of-Partition (EOP) ................................... 171

Recoverable Data Error..........................................................................171

Unrecoverable Data Error ..................................................................... 171

Incorrect Length..................................................................................... 172

Fixed Mode Residual Data .................................................................... 173

Variable Mode Residual Data ............................................................... 174

Completion Status ..................................................................................175

READ BLOCK LIMITS Command ............................................................. 177

Returned Data ......................................................................................... 178

Completion Status ..................................................................................179

READ BUFFFER Command.........................................................................180

Read Buffer Header................................................................................182

Read Buffer Descriptor........................................................................... 183

Echo Buffer Descriptor........................................................................... 183

Echo Buffer...............................................................................................184

MAM Page Identification ......................................................................184

Completion Status ..................................................................................186

READ POSITION Command....................................................................... 187

Returned Data ......................................................................................... 189

Completion Status ..................................................................................193

RECEIVE DIAGNOSTIC RESULTS Command ........................................ 194

Returned Data ......................................................................................... 195

Completion Status ..................................................................................200

RELEASE UNIT Command.......................................................................... 201

6-Byte Command Descriptor Block...................................................... 201

10-Byte Command Descriptor Block.................................................... 202

Completion Status ..................................................................................204

REPORT DENSITY SUPPORT Command ................................................. 205

Returned Data ......................................................................................... 206

Report Density Support Data Block Descriptor ................................. 207

Completion Status ..................................................................................210

REPORT LUNS Command........................................................................... 211

LTO-2 SCSI Interface Guide vi

Contents

Returned Data ......................................................................................... 212

Completion Status ..................................................................................214

REQUEST SENSE Command....................................................................... 215

Sense Data Management........................................................................215

Returned Data ......................................................................................... 217

Sense Key Values ....................................................................................222

Additional Sense Codes and Code Qualifiers .................................... 231

Vendor Unique Message Codes ........................................................... 241

Completion Status ..................................................................................242

RESERVE UNIT Command.......................................................................... 243

Completion Status ..................................................................................246

REWIND Command......................................................................................247

Completion Status ..................................................................................249

SEND DIAGNOSTIC Command................................................................250

Diagnostic Pages ..................................................................................... 252

Completion Status ..................................................................................254

SET CAPACITY Command.......................................................................... 256

Completion Status ..................................................................................258

SPACE Command.......................................................................................... 260

Space-By-Count Functions .................................................................... 262

Space-to-EOD Function.......................................................................... 263

Completion Status ..................................................................................263

TEST UNIT READY Command................................................................... 265

Completion Status ..................................................................................266

VERIFY Command ........................................................................................ 268

Command Operation .............................................................................269

Completion Status ..................................................................................270

WRITE Command.......................................................................................... 272

Completion Status ..................................................................................274

WRITE BUFFER Command..........................................................................276

Soft Microcode Download..................................................................... 278

Hard Microcode Download .................................................................. 278

Echo Buffer...............................................................................................279

Write Buffer Data Header...................................................................... 279

Completion Status ..................................................................................280

WRITE FILEMARKS Command.................................................................. 281

Completion Status ..................................................................................282

LTO-2 SCSI Interface Guide vii

Contents

Appendix A Message Codes 284

Index 467

LTO-2 SCSI Interface Guide viii

Tables

Table 1 SCSI Message Codes................................................................................... 4

Table 2 Drive to Host SCSI Messages.................................................................... 5

Table 3 Host to Drive SCSI Messages.................................................................... 6

Table 4 Extended SCSI Messages ...........................................................................8

Table 5 Parity Error Cases ....................................................................................... 9

Table 6 IN Phase During Which ATN is Raised #1........................................... 12

Table 7 IN Phase During Which ATN is Raised #2........................................... 13

Table 8 Exception Actions and Action Codes .................................................... 14

Table 9 SCSI Command Set...................................................................................24

Table 10 SCSI 6-Byte Command Descriptor Block Data Format....................... 27

Table 11 SCSI 10-Byte Command Descriptor Block — Data Format ................ 27

Table 12 Command Descriptor Block — Field Descriptions.............................. 28

Table 13 Operation Code Format — Data Format............................................... 28

Table 14 Operation Code Format—Field Descriptions.......................................28

Table 15 Control Byte Format ................................................................................. 29

Table 16 Control Byte Format —Field Descriptions............................................ 29

Table 17 Status Byte Format....................................................................................30

LTO-2 SCSI Interface Guide ix

Tables

Table 18 Status Byte Field Descriptions ................................................................30

Table 19 Status Codes .............................................................................................. 31

Table 20 ERASE Command Descriptor Block — Data Format.......................... 32

Table 21 ERASE Command Descriptor Block — Field Descriptions................ 32

Table 22 ERASE Command Completion Status................................................... 34

Table 23 INQUIRY Command Descriptor Block — Data Format ..................... 36

Table 24 INQUIRY Command Descriptor Block — Field Descriptions ........... 36

Table 25 Standard Inquiry Data Page — Data Format........................................ 39

Table 26 Standard Inquiry Data Page — Field Descriptions.............................. 40

Table 27 Supported Vital Product Data Inquiry Page — Data Format ............ 42

Table 28 Supported Vital Product Data Inquiry Page —Field Descriptions ... 43

Table 29 Unit Serial Number Page (80h) — Data Format................................... 45

Table 30 Unit Serial Number Page (80h) —Field Descriptions.......................... 45

Table 31 Device Identification Page (83h) — Data Format................................. 46

Table 32 Device Identification Page (83h) — Field Descriptions....................... 46

Table 33 Identification Descriptor — Data Format.............................................. 47

Table 34 Identification Descriptor — Field Descriptions....................................47

Table 35 Drive Component Revision Levels Pages (C0h, C1h) — Data

Format ........................................................................................................ 48

Table 36 Drive Component Revision Levels Pages (C0h, C1h) — Field

Descriptions............................................................................................... 49

Table 37 Drive Component Serial Number Page (C2, C3, C4, C5, C6h)

— Data Format .......................................................................................... 50

Table 38 Drive Component Serial Number Page (C2, C3, C4, C5, C6h)

—Field Descriptions................................................................................. 50

Table 39 Drive Status Page (DFh) — Data Format .............................................. 52

Table 40 Drive Status Page (DFh) — Field Descriptions ....................................53

Table 41 Drive State Field Values........................................................................... 57

Table 42 Cartridge Type Field Values ...................................................................58

Table 43 Command Support Data — Data Format .............................................59

LTO-2 SCSI Interface Guide x

Tables

Table 44 Command Support Data — Field Descriptions ................................... 59

Table 45 INQUIRY Command Completion Status.............................................. 61

Table 46 LOAD UNLOAD Command Descriptor Block — Data Format........ 62

Table 47 LOAD UNLOAD Command Descriptor Block — Field

Descriptions............................................................................................... 62

Table 48 Medium Loadable Position ..................................................................... 64

Table 49 Medium Auxiliary Memory Accessible Position ................................. 65

Table 50 Medium Loaded and Ready Position .................................................... 66

Table 51 LOAD UNLOAD Command Completion Status.................................67

Table 52 LOCATE Command Descriptor Block — Data Format ......................69

Table 53 LOCATE Command Descriptor Block — Field Descriptions ............ 70

Table 54 LOCATE Command Completion Status ...............................................71

Table 55 LOG SELECT Command Descriptor Block — Data Format .............. 73

Table 56 LOG SELECT Command Descriptor Block — Field Descriptions .... 74

Table 57 Log Page Header — Data Format .......................................................... 75

Table 58 Log Page Header — Field Descriptions ................................................ 76

Table 59 Log Parameter — Data Format............................................................... 76

Table 60 Log Parameter — Field Descriptions.....................................................77

Table 61 Supported Log Pages ............................................................................... 78

Table 62 LOG SELECT Command Completion Status ....................................... 80

Table 63 LOG SENSE Command Descriptor Block — Data Format................. 81

Table 64 LOG SENSE Command Descriptor Block — Field Descriptions....... 82

Table 65 Supported Log Pages ............................................................................... 84

Table 66 Log Page Header — Data Format .......................................................... 85

Table 67 Log Page Header — Field Descriptions ................................................ 86

Table 68 Log Parameter — Data Format............................................................... 86

Table 69 Log Parameter — Field Descriptions.....................................................87

Table 70 Supported Log Pages Log Page (00h) — Data Format........................ 88

Table 71 Supported Log Pages Log Page (00h) — Field Descriptions.............. 89

LTO-2 SCSI Interface Guide xi

Tables

Table 72 Write Error Counters Log Page (02h) Page and Parameter

Descriptions............................................................................................... 91

Table 73 Read Error Counters Log Page (03h) Page and Parameter

Descriptions............................................................................................... 92

Table 74 Sequential Access Device Log Page (0Ch) Page and Parameter

Descriptions............................................................................................... 93

Table 75 Device Statistics Log Page (14h) Page and Parameter

Descriptions............................................................................................... 94

Table 76 Device Statistics Log Page (14h) Parameter Code................................ 95

Table 77 Tape Diagnostic Data Log Page (16h) — Page Descriptions.............. 96

Table 78 Tape Diagnostic Data Log Page (16h) Parameter Header .................. 97

Table 79 Tape Diagnostic Data Log Page (16h) Parameter Header — Field

Descriptions............................................................................................... 98

Table 80 Tape Alert Log Page (2Eh) Page Information..................................... 100

Table 81 Supported TapeAlert Flags ................................................................... 101

Table 82 Drive Conditions Setting/Clearing TapeAlert Flags ........................105

Table 83 Media Error to TapeAlert Correlation................................................. 108

Table 84 Table Heading Descriptions and Abbreviations................................ 110

Table 85 Tape Usage Log Page (30h) — Page and Parameter

Descriptions............................................................................................. 111

Table 86 Tape Capacity Log Page (31h) — Page and Parameter

Descriptions............................................................................................. 112

Table 87 Compression Log Page (32h) — Page and Parameter

Descriptions............................................................................................. 113

Table 88 Error Events Log Page (33h) — Page Description .............................114

Table 89 Error Events Log Page (33h) — Parameter Header — Data

Format ...................................................................................................... 115

Table 90 Error Events Log Page (33h) — Parameter Header — Field

Descriptions............................................................................................. 116

Table 91 LOG SENSE Command Completion Status........................................ 118

Table 92 MODE SELECT 6-Byte Command Descriptor Block — Data

Format ...................................................................................................... 120

Table 93 MODE SELECT 6-Byte Command Descriptor Block — Field

LTO-2 SCSI Interface Guide xii

Descriptions............................................................................................. 120

Table 94 MODE SELECT 10-Byte Command Descriptor Block — Data

Format ...................................................................................................... 121

Table 95 MODE SELECT 10-Byte Command Descriptor Block — Field

Descriptions............................................................................................. 122

Table 96 MODE SELECT 6-Byte CDB Mode Parameter Header — Data

Format ...................................................................................................... 123

Table 97 MODE SELECT 6-Byte CDB Mode Parameter Header — Field

Descriptions............................................................................................. 123

Table 98 MODE SELECT 10-Byte CDB Mode Parameter Header — Data

Format ...................................................................................................... 124

Table 99 MODE SELECT 10-Byte CDB Mode Parameter Header — Field

Descriptions............................................................................................. 125

Table 100 MODE SELECT Parameter List Block Descriptor — Data

Format ...................................................................................................... 126

Table 101 MODE SELECT Parameter List Block Descriptor — Field

Descriptions............................................................................................. 126

Tables

Table 102 Mode Parameter Pages ..........................................................................127

Table 103 Mode Parameter Page — Data Format................................................ 127

Table 104 Mode Parameter Page Field Descriptions........................................... 128

Table 105 Disconnect/Reconnect Mode Page (02h) — Data Format................ 129

Table 106 Disconnect/Reconnect Mode Page (02h) — Field Descriptions...... 130

Table 107 Control Mode Page (0Ah) — Data Format .........................................131

Table 108 Control Mode Page (0Ah) —Field Descriptions ................................ 131

Table 109 Data Compression Control Mode Page (0Fh) — Data Format ........ 133

Table 110 Data Compression Control Mode Page (0Fh) — Field

Descriptions............................................................................................. 134

Table 111 Sequential Access Device Configuration Mode Page (10h)

— Data Format ........................................................................................ 136

Table 112 Sequential Access Device Configuration Mode Page (10h)

— Field Descriptions .............................................................................. 137

Table 113 Informational Exceptions Mode Page (1Ch) — Data Format........... 140

Table 114 Informational Exceptions Mode Page (1Ch) —Field

LTO-2 SCSI Interface Guide xiii

Tables

Descriptions............................................................................................. 140

Table 115 Drive Capabilities Control Mode Page (21h) — Data Format.......... 143

Table 116 Drive Capabilities Control Mode Page (21h) — Field

Descriptions............................................................................................. 143

Table 117 Interface Control Mode Page (22h) — Data Format.......................... 146

Table 118 Interface Control Mode Page (22h) — Field Descriptions................ 147

Table 119 MODE SELECT Command Completion Status ................................. 150

Table 120 MODE SENSE Command 6-Byte Command Descriptor Block

— Data Format ........................................................................................ 151

Table 121 MODE SENSE Command 6-Byte Command Descriptor Block

— Field Descriptions .............................................................................. 152

Table 122 MODE SENSE Command 10-Byte Command Descriptor Block

— Data Format ........................................................................................ 153

Table 123 MODE SENSE Command 10-Byte Command Descriptor Block

— Field Descriptions .............................................................................. 154

Table 124 6-Byte CDB Mode Parameter Header — Data Format...................... 156

Table 125 6-Byte CDB Mode Parameter Header — Field Descriptions............ 156

Table 126 10-Byte CDB Mode Parameter Header — Data Format.................... 157

Table 127 10-Byte CDB Mode Parameter Header — Field Descriptions.......... 158

Table 128 Block Descriptor — Data Format.......................................................... 159

Table 129 Block Descriptor — Field Descriptions................................................ 159

Table 130 Mode Parameter Pages ..........................................................................160

Table 131 MODE SENSE Command Completion Status.................................... 161

Table 132 PARK UNPARK Command Descriptor Block — Data Format....... 162

Table 133 PARK UNPARK Command — Field Descriptions............................ 162

Table 134 PARK UNPARK Command Completion Status................................163

Table 135 PREVENT ALLOW MEDIUM REMOVAL Command

Descriptor Block — Data Format..........................................................164

Table 136 PREVENT ALLOW MEDIUM REMOVAL Command

Descriptor Block — Field Descriptions................................................ 165

Table 137 PREVENT ALLOW MEDIUM REMOVAL — Completion

Status ........................................................................................................ 166

LTO-2 SCSI Interface Guide xiv

Tables

Table 138 READ Command Descriptor Block — Data Format ......................... 168

Table 139 READ Command Descriptor Block — Field Descriptions ...............168

Table 140 READ Command —Completion Status .............................................. 175

Table 141 READ BLOCK LIMITS Command Descriptor Block — Data

Format ...................................................................................................... 177

Table 142 READ BLOCK LIMITS Command —Field Descriptions.................. 177

Table 143 READ BLOCK LIMITS Returned Data — Data Format ...................178

Table 144 READ BLOCK LIMITS Returned Data — Field Descriptions ......... 178

Table 145 READ BLOCK LIMITS Command Completion Status..................... 179

Table 146 READ BUFFER Command Descriptor Block — Data Format ......... 180

Table 147 READ BUFFER Command Descriptor Block — Field

Descriptions............................................................................................. 180

Table 148 READ BUFFER Header Descriptor — Data Format.......................... 182

Table 149 READ BUFFER Header Descriptor — Field Descriptions................ 182

Table 150 READ BUFFER Descriptor — Data Format........................................ 183

Table 151 READ BUFFER Descriptor — Field Descriptions.............................. 183

Table 152 Echo Buffer Descriptor — Data Format............................................... 183

Table 153 Echo Buffer Descriptor — Field Descriptions..................................... 184

Table 154 MAM Page Identification ......................................................................185

Table 155 READ BUFFER Completion Status......................................................186

Table 156 READ POSITION Command Descriptor Block —Data Format..... 187

Table 157 READ POSITION Command Descriptor Block —Field

Descriptions............................................................................................. 187

Table 158 Read Position Data — Long and TCLP Bits Set To 0 — Data

Format ...................................................................................................... 189

Table 159 READ POSITION Data — Long and TCLP Bits Set To 0

— Field Descriptions .............................................................................. 190

Table 160 READ POSITION Data — Long and TCLP Bits Set To 1

— Data Format ........................................................................................ 191

Table 161 READ POSITION Data — Long and TCLP Bits Set To 1

— Field Descriptions .............................................................................. 192

LTO-2 SCSI Interface Guide xv

Tables

Table 162 READ POSITION Completion Status.................................................. 193

Table 163 RECEIVE DIAGNISTOC RESULTS Command Descriptor

Block — Data Format ............................................................................. 194

Table 164 RECEIVE DIAGNISTOC RESULTS Command Descriptor

Block — Field Descriptions....................................................................194

Table 165 Returned Data Format If PCV Is Not Set ............................................196

Table 166 Field Descriptions If PCV Is Not Set....................................................196

Table 167 Returned Data If PCV Set ...................................................................... 197

Table 168 Returned Data If PCV Set, Page Code = 81h ...................................... 197

Table 169 Field Descriptions — PCV Not Set....................................................... 198

Table 170 RECEIVE DIAGNISTIC RESULTS Completion Status ..................... 200

Table 171 RELEASE UNIT 6-Byte Command Descriptor Block — Data

Format ...................................................................................................... 201

Table 172 RELEASE UNIT 6-Byte Command — Field Descriptions................ 202

Table 173 RELEASE UNIT 10-Byte Command Descriptor Block —

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

Table 174 RELEASE UNIT 10-Byte Command — Field Descriptions.............. 203

Table 175 RELEASE UNIT COMMAND — Completion Status ....................... 204

Table 176 REPORT DENSITY SUPPORT Command Descriptor Block

— Data Format ........................................................................................ 205

Table 177 REPORT DENSITY SUPPORT Command Descriptor Block

— Field Descriptions .............................................................................. 205

Table 178 REPORT DENSITY SUPPORT Header — Data Format ...................206

Table 179 REPORT DENSITY SUPPORT Header — Field Descriptions ......... 206

Table 180 REPORT DENSITY SUPPORT Data Block Descriptor

— Data Format ........................................................................................ 207

Table 181 REPORT DENSITY SUPPORT Data Block Descriptor – Field

Descriptions............................................................................................. 208

Table 182 REPORT DENSITY SUPPORT Completion Status............................ 210

Table 183 REPORT LUNS Command Descriptor Block — Data Format......... 211

Table 184 REPORT LUNS Command Descriptor Block — Field

Descriptions............................................................................................. 212

LTO-2 SCSI Interface Guide xvi

Tables

Table 185 REPORT LUNS Header Data — Data Format....................................212

Table 186 REPORT LUNS Header Data — Field Descriptions.......................... 213

Table 187 REPORT LUNS Completion Status...................................................... 214

Table 188 REQUEST SENSE Command Descriptor Block — Data Format..... 216

Table 189 REQUEST SENSE Command Descriptor Block — Field

Descriptions............................................................................................. 216

Table 190 Returned Sense Data — Data Format..................................................217

Table 191 Returned Sense Data — Field Descriptions........................................ 218

Table 192 Sense Key Values ....................................................................................222

Table 193 Additional Sense Codes and Code Qualifiers .................................... 231

Table 194 REQUEST SENSE Command Completion Status.............................. 242

Table 195 RESERVE UNIT 6-Byte Command Descriptor Block — Data

Format ...................................................................................................... 243

Table 196 RESERVE UNIT 6-Byte Command Descriptor Block — Field

Descriptions............................................................................................. 244

Table 197 RESERVE UNIT 10-Byte Command Descriptor Block — Data

Format ...................................................................................................... 244

Table 198 RESERVE UNIT 10-Byte Command Descriptor Block — Field

Descriptions............................................................................................. 245

Table 199 RESERVE UNIT Completion Status..................................................... 246

Table 200 REWIND Command DesMcriptor Block — Data Format................ 247

Table 201 REWIND Command Descriptor Block — Field Descriptions.......... 248

Table 202 REWIND Command Completion Status.............................................249

Table 203 SEND DIAGNOSTIC Command Descriptor Block — Data

Format ...................................................................................................... 250

Table 204 SEND DIAGNOSTIC Command Descriptor Block — Field

Descriptions............................................................................................. 251

Table 205 Diagnostic Page Format.........................................................................252

Table 206 Supported Diagnostic Pages ................................................................. 252

Table 207 Memory Test Pattern Diagnostic Page — Data Format ....................253

Table 208 Memory Test Pattern Diagnostic Page — Field Descriptions .......... 253

LTO-2 SCSI Interface Guide xvii

Tables

Table 209 SEND DIAGNOSTIC Command Completion Status........................ 254

Table 210 SET CAPACITY Command Descriptor Block — Data Format........ 256

Table 211 SET CAPACITY Command Descriptor Block — Field

Descriptions............................................................................................. 257

Table 212 SET CAPACITY Command Completion Status................................. 258

Table 213 SPACE Command Descriptor Block — Data Format........................ 260

Table 214 SPACE Command Descriptor Block — Field Descriptions.............. 261

Table 215 SPACE Command Completion Status................................................. 263

Table 216 TEST UNIT READY Command Descriptor Block — Data

Format ...................................................................................................... 265

Table 217 TEST UNIT READY Command Descriptor Block Field

Descriptions............................................................................................. 266

Table 218 TEST UNIT READY Completion Status..............................................266

Table 219 VERIFY Command Descriptor Block — Data Format ...................... 268

Table 220 VERIFY Command Descriptor Block — Field Descriptions ............ 269

Table 221 VERIFY Command Completion Status ............................................... 270

Table 222 WRITE Command Descriptor Block — Data Format........................272

Table 223 WRITE Command Descriptor Block — Field Descriptions.............. 272

Table 224 WRITE Command Completion Status.................................................274

Table 225 WRITE BUFFER Command Descriptor Block — Data Format........ 276

Table 226 WRITE BUFFER Command Descriptor Block — Field

Descriptions............................................................................................. 276

Table 227 Write Buffer Data Header — Data Format ......................................... 279

Table 228 Write Buffer Data Header — Field Descriptions ............................... 279

Table 229 WRITE BUFFER Completion Status .................................................... 280

Table 230 WRITE FILEMARKS Command Descriptor Block — Data

Format ...................................................................................................... 281

Table 231 WRITE FILEMARKS Command Descriptor Block — Field

Descriptions............................................................................................. 281

Table 232 WRITE FILEMARKS Completion Status ............................................ 282

LTO-2 SCSI Interface Guide xviii

Preface

This document describes the SCSI interfaces for the LTO-2 tape drive.

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

understanding of SCSI principles and technology.

Purpose This manual describes the SCSI specifications for the LTO-2 tape drive.

For drive-specific installation and operational information, including connector information, refer to the Installation Guide or Product Manual for the specific model of your drive.

Document Organization

LTO-2 SCSI Interface Guide xix

This guide is organized as follows:

• Chapter 1, SCSI Interface relates to drive function.

• Chapter 2, SCSI Commands manual along with their operation codes. It also describes the format of Command Descriptor Blocks, Operation Codes, the Control Byte, and the Status Byte. It describes in detail all the SCSI commands

discusses SCSI interface operation as it

, lists the SCSI Commands detailed in this

supported by the LTO-2 tape drive. Each command is described, its Command Descriptor Block (CDB) is illustrated, and the Completion Status is given.

• Appendix A, Message Codes

This guide concludes with an index.

Preface

Conventions Used In This Manual

This manual uses the following conventions:

•Notes:

Note: Notes emphasize important information related to the

main topic.

• 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

LTO-2 SCSI Interface Guide xx

Preface

1SCSI Interface

Quantum LTO drives are designed for computer environments requiring high performance, ultra-high capacity data storage. The drives are available in 5.25-inch internal configurations or as an external subsystem.

Quantum LTO drives contain an embedded Small Computer Systems Interface (SCSI) controller. The parallel SCSI drives provide synchronous or asynchronous SCSI with high speed burst transfers of up to 160 megabytes/second. The internal drives are tailored for easy installation in today's computers and the full-featured embedded controller facilitates easy integration into a variety of systems.

This chapter discusses interface operation as it pertains to drive functions.

Overview 1

ANSI Standards 1 SCSI is a set of standard interfaces established to support peripheral

equipment such as printers, tape drives, magnetic disks, optical disks for microcomputers and other computer systems. The Parallel SCSI bus can support up to sixteen devices consisting of any multiple of host adapters and peripheral devices.

LTO-2 SCSI Interface Guide 1

Chapter 1 SCSI Interface

Parallel SCSI Interface

Quantum LTO drives comply with SCSI-2 and SCSI-3 specifications. In a few cases, vendor unique features are available. These features are compatible with the SCSI standards.

LTO drives support LUN 0 in stand-alone mode and can support LUN 1 when installed in a media changer (tape autoloader or library).

In addition to the information presented in this manual, we recommend that you review the applicable SCSI-3 standards before writing host software drivers. Also, see the conformance statements, which are given in the Product Description Manual for each model of LTO drive.

Cabling and Connectors 1 The cabling requirements and pin assignments for the SCSI connector for

the internal drive models are given in the respective installation guide and product manual for each model of LTO drive.

General Features 1 The LTO tape drive supports the following:

• Operation in both single and multi-initiator systems

• Fixed and variable block transfer lengths

• Space blocks, filemarks, and EOD

•

LOG SENSE and LOG SELECT for managing soft error reporting

• Multiple LUN support for command forwarding of LUN 1 command to libraries

• Multiple Initiator support

Parallel SCSI Interface 1

General Features 1 The LTO tape drive supports the following:

• Integrated single-ended and low voltage differential SCSI transceivers

• ST data transfers with parity protection running a max rate of 80Mbytes/sec

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Parallel SCSI Interface

• DT data transfers with CRC protection running a max rate of 160Mbytes/sec

• 16 bit SCSI arbitration

• Disconnect/reconnect

•Hard reset

Disconnect/Reconnect Function

When the drive is performing a task not requiring communication with the Initiator or when the tape drive determines that a relatively long time

has passed with no bus activity, it disconnects from the SCSI bus. Examples are:

• When rewinding the tape.

• When writing to the tape and the buffer is full.

• When reading from the tape and the buffer is empty.

• When spacing, locating, or generally performing any tape motion when data cannot be transferred on the SCSI bus.

During the time the Target is disconnected for one of these functions, the bus is free for use by other devices. Both disconnect and reconnect are initiated by the Target.

If the tape drive is selected while disconnected, it only allows the following actions:

• If the command is from a different initiator or is from the same initiator but to a different LUN, the tape drive accepts the command and immediately disconnects if the command is a media-access command. If the new command is a

TEST UNIT READY, then the new command is executed immediately.

REQUEST SENSE, INQUIRY or

• Immediately following the selection, the Initiator may send the Identify, No Op, Abort, or Bus Device Reset messages to the drive.

• If the command is from the same initiator to the same LUN, the current command terminates with a Check Condition and an Abort Sense Key.

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Parallel SCSI Interface

SCSI Messages 1 The SCSI message codes, descriptions, and directions are given in the

following table. Each of these SCSI messages are supported by the Quantum LTO drive.

Table 1 SCSI Message Codes

Code Description Direction

00h Command Complete In

01h Extended Message

In/Out

02h Save Data Pointer In

03h Restore Pointers In

04h Disconnect In

05h Initiator Detected Error Out

06h Abort Out

07h Message Reject In/Out

08h No Operation Out

09h Message Parity Error Out

0Ch Bus Device Reset Out

23h Ignore Wide Residue In

80h+ Identify In/Out

a. In = Drive to host. b. Only three extended messages are supported: Parallel Protocol Request, Synchronous Data Transfer Request, and Wide Data Transfer Request. c. Out = Host to drive.

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Inbound Messages 1 Table 2 lists drive-to-host SCSI messages and their definitions.

Table 2 Drive to Host SCSI Messages

Hex

Message

Command Complete

Code Definition

00h This message is sent by the drive at the end

of the status phase to indicate that a command is complete. Once the message is sent, the drive releases the bus and goes to Bus Free

Disconnect 04h This message is sent by the drive to indicate

that it is about to disconnect from the bus and go to Bus Free. During a Data phase, it is always preceded by a Save Data Pointers message. If a Message Reject message is received in response to this message, then the disconnect is prevented.

Extended

01h See Extended Messages

on page 8.

Message

Identify 80h+ An Identify in message is sent to the initiator

during reconnect to indicate which Logical Unit is reconnecting. The Disconnect Privilege and LUNTAR flags will both be clear

Ignore Wide Residue

23h This message is sent by the drive to the

initiator to indicate that a byte on a wide bus is not valid. This will be supported whenever a wide transfer is active.

Message Reject

07h This message is sent to the initiator when the

message received by the drive is unsupported or inappropriate.

LTO-2 SCSI Interface Guide 5

Message

Chapter 1 SCSI Interface

Parallel SCSI Interface

Hex

Code Definition

Restore Pointers

03h This message causes the initiator to reset its

data transfer pointers to the values they held when the last Save Data Pointers message was sent. It will be sent when a parity error is detected on the bus or when an Initiator Detected Error message is received in order to retry the data phase.

Save Data Pointer

02h This message instructs the initiator to save

its current data transfer pointer for use with a subsequent Restore pointers message. This message will always be sent before a Disconnect message during data phases.

Outbound Messages 1 Table 3 lists host-to-drive SCSI messages and their definitions.

Table 3 Host to Drive SCSI Messages

Message

Hex

Code Definition

Abort 06h An abort condition is generated. See

Message Exception Handling

on page 12.

Bus Device Reset

Extended

0Ch A reset condition is generated. See Message

Exception Handling on page 12.

01h See Extended Messages

on page 8.

Message

Identify 80h+ The Identify Out message is sent by the

initiator to identify the Logical Unit to be accessed and to set Disconnect Privilege. The LUNTAR flag must be zero.

The Identify Out message must be sent as the first thing after selection. If it is sent at any other time, the drive will respond with a message reject message and go to Bus Free.

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Message

Chapter 1 SCSI Interface

Parallel SCSI Interface

Hex

Code Definition

Initiator Detected Error

Message Parity Error

Message Reject

05h The initiator has detected an error in the data

being sent in a Message Command, Data or Status phase. The drive will retry the data burst or message.

If the message is received immediately after an Identify message or after the Command Complete message has been sent, the drive will go Bus Free.

09h The initiator has detected a parity error in a

message. The drive will retry the message.

If the message is received during a Command, Data or Status phase, immediately after an Identify message or after the Command Complete message has been sent, the drive will go Bus Free.

07h This message is sent when the initiator does

not support a message sent by the drive or considers the message inappropriate. If the message being rejected is Disconnect, Synchronous Data Transfer Request or Wide Data Transfer Request, the operation continues without those features. For all other messages except Restore Pointers, the message is treated as an Abort message.

If the message is received during a Command, Data or Status phase, immediately after an Identify message or after the command complete message has been sent, the drive will go Bus Free.

08h This message has no effect and is ignored.

Operation

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Parallel SCSI Interface

Extended Messages 1 The following table lists extended SCSI messages and their definitions.

Table 4 Extended SCSI Messages

Hex Code Message Definition

Synchronous Data Transfer Request

01h This message negotiates an agreement

between the initiator and the drive on which is the best data period and offset.

If the message is received after selection and before command phase, it will then go to Message In phase and respond with a valid response to complete the negotiation.

If the message is received at any other time, a Message Reject is sent in response.

Wide Data Transfer Request

03h This message negotiates an agreement

between the initiator and the drive on which is the best data width - 8-bit narrow or 16-bit wide.

If the message is received after selection and before Command phase, it will then go to Message In phase and respond with a valid response to complete the negotiation.

If the message is received at any other time, a Message Reject is sent in response.

LTO-2 SCSI Interface Guide 8

Hex Code Message Definition

Chapter 1 SCSI Interface

Parallel SCSI Interface

Parallel Protocol Request

04h This message negotiates an agreement

between the initiator and the drive on which is the best data transfer period, offset, width and type. This is the message to request DT (Ultra160) synchronous transfers.

If the message is received after selection and before Command phase, it will then go to Message In phase and respond with a valid response to complete the negotiation.

If the message is received at any other time, a Message Reject is sent in response.

Parity Errors 1 Table 5 describes the operation for each of the possible cases of parity

error.

Table 5 Parity Error Cases

State or Phase Description

Bus Free State The drive does not detect nor react to parity errors on the SCSI bus while the

drive is in a bus free state.

Arbitration Phase The drive does not detect nor react to parity errors on the SCSI bus while

arbitration is being performed.

Selection Phase The drive does not detect nor react to parity errors on the SCSI bus while the

drive is being selected.

Selection, Message Out Phase (Identify

If the drive detects a parity error while the host is sending an Identify message, the drive retries forever.

Message)

LTO-2 SCSI Interface Guide 9

State or Phase Description

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Parallel SCSI Interface

Reselection, Message In Phase (Identify Message)

If the drive is attempting to reconnect to the host and the host asserts ATN because it detected an error, the drive:

• Switches the host to the Message Out Phase.

• Waits for the host to send a 09 (Parity Error Message).

The drive then performs the retry option by:

• Switching the host to the Message In Phase.

• Resending the Identify Message.

Command Phase If the drive detects a parity error while the host is transferring a CDB, the

drive:

• Switches the host to Message In phase

• Sends Restore Data Pointers (03h) message

• Switches the host to Command phase to retry the command.

If a parity error occurs on the retry the host:

• Terminates the transfer.

• Switches the host to the Status Phase and sends a Check Condition.

• Switches the host to the Message In Phase and sends a Command Complete.

• Sets the Sense Key = B and ASC/ASCQ = 47-00 (SCSI-2 only).

Data In Phase If the host detects a parity error while data is being transferred from the

drive and asserts ATN, the drive:

• Terminates the transfer of data.

• Switches the host to the Message Out Phase.

• Waits for the host to send a 05 (Host Detected Error).

• Switches the host to the Status Phase and sends a Check Condition.

• Switches the host to the Message In Phase and sends a Command Complete.

• Sets the Sense Key = B and ASC/ASCQ = 48-00 (SCSI-2 only).

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State or Phase Description

Data Out Phase If the drive detects a parity error while the host is transferring data, the

drive:

• Terminates the transfer of data.

• Switches the host to the Status Phase and sends a Check Condition.

• Switches the host to the Message In Phase and sends Command Complete.

• Sets the Sense Key = B and ASC/ASCQ = 47-00 (SCSI-2 only).

Status Phase If the host is in the Status phase and detects an error in the status byte and

asserts ATN, the drive:

• Switches the host to the Message Out Phase and waits for the host to send 05 (Initiator Detected Error).

• Switches the host to the Status Phase and sends a Check Condition.

• Target sends restore pointers and resends Status.

Message In Phase If the host is in the Message In Phase and detects an error on a message bytes

an asserts ATN, the drive:

• Switches the host to the Message Out Phase.

• Waits for the host to send 09 (Parity Error Message).

• Switches the host to the Message In Phase and resends the message.

Message Out Phase If the host is in the Message Out Phase and sends a message bytes and the

drive detects a parity error, the drive retries forever.

An Initiator that accommodates disconnect/reconnect can indicate this capability to the tape drive during the Selection phase by asserting both its own Initiator SCSI ID bit as well as the tape drive's SCSI ID bit (allows the tape drive to know with which Initiator to reconnect). The Initiator must also assert ATN before exiting the Selection phase (prior to releasing SEL) and send an Identify message out of C0h to the tape drive. This sequence causes the drive to enter the Message-Out phase when the Selection phase completes.

The first message sent by the host after the Selection phase is an Identify message. Under normal conditions, the first message sent by the tape drive after a Reselection phase is also Identify. Under certain exceptional conditions, the host may send the Abort message or the Bus Device Reset message instead of Identify as the first message.

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Message Exception Handling

Message exceptions are handled as described in table 6 and table 7. The numbers in the tables identify the actions that the drive takes when an exception under the identified conditions occurs. The actions and action codes are defined in table 8

Table 6 IN Phase Durin g Wh i c h ATN is Raised #1

Message Selection Identify Command Data in Data out Status Negotiate

Abort (06h) 2 2 2 2 2 2 2

BDR (0Ch)1111 111111 11 11

Identify

12 7 7 7 7 7 7

(80h/C0h)

IDE (05h) 5 2 If Retry, 8,

else 5

If Retry, 8, else

If Retry,

8, else 5

If Retry, 8, if

Status, 2, if

No Status, 5

If Retry, 4,

else 5

Reject (07h) 5 2 2 2 2 2 1

Parity (09h) 5 2 11 11 11 11 If Retry, 4,

else 5

NOP (08h) 5 9 9 9 9 9 If EOM, 9,

else 4

Negotiate 5 10 7 7 7 7 10

Unrecognized

or illegal

LTO-2 SCSI Interface Guide 12

56 666 6If EOM, 6,

else 4

Table 7 IN Phase During Which ATN is Raised #2

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Parallel SCSI Interface

Ignore

Wide

Residue

(23h)

Message

Save

Data

Pointers

(02h)

Restore

Pointers

(03h)

Disconne

ct (04h)

Reject

Message

(07h)

Identify

(80h)

Comman

Complete

(00h)

Abort (06h)2222222

BDR (0Ch)11111111111111

Identify

7777727

(80h/C0h)

IDE (05h) If Retry, 4

else 5

If Status,

2, if No

If Retry, 4, else 5

If Retry,

4, else 13

If retry, 4,

else 5

2If retry, 4,

else 5

Status, 5

Reject (07h) 2 If Status,

12222

2, if No

Status, 5

Parity (09h) If Retry, 4

else 5

If Status,

2, if No

If Retry, 4, else 5

If Retry,

4, else 13

If Retry, 4, else 5

2If Retry,

4, else 5

Status, 5

NOP (08h) 9 9 9 9 9 2 If EOM, 9,

else 4

Negotiate7777727

Unrecognize

d or illegal

LTO-2 SCSI Interface Guide 13

666662If EOM, 6,

else 4

Table 8 Exception Actions and Action Codes

Action or Action Code from Ta ble 6 and Table 7

Retry Retry has not been exhausted.

EOM End of the message.

Negotiate PPR, SDTR or WDTR message negotiate.

Status Status has been reported.

No Status Status has not been reported.

1 Disconnect message case - the drive will not

Chapter 1 SCSI Interface

Parallel SCSI Interface

Description

disconnect for the rest of the command.

PPR message case - both the initiator and the

drive go to asynchronous mode and 8-bit

narrow.

SDTR message case - both the initiator and the

drive go to asynchronous mode.

WDTR message case - both the initiator and

the drive go to asynchronous mode and 8-bit

narrow.

Default case - The Message Out Reject disables

the feature and continues.

2 The drive goes Bus Free without setting up

sense data.

3 Reserved.

4 The drive resends the message.

5 The drive issues Check Condition status and

sets up sense data indicating an Aborted

command.

6The drive rejects the message by issuing

Message Reject message and continues its

operation.

LTO-2 SCSI Interface Guide 14

Action or Action Code from Table 6 and Table 7

7 The drive rejects the message by issuing

8 The drive issues Restore Pointers message and

9 The drive ignores the message and continues.

10 Negotiations per SPI-3 spec.

11 The drive goes Bus Free and sets up sense

12 The drive accepts the Identify message,

Chapter 1 SCSI Interface

Standards Conformance

Description

Message Reject message. The drive goes Bus Free without setting up sense data.

retries unless retry count exhausted.

data.

observes the disconnect-privilege bit in the Identify message and then continues.

13 If the drive is continuing an operation after

sending a Message in Reject, then the drive issues Check Condition status and sets up sense data indicating an Aborted command (Action 5); if not, then the drive goes Bus Free without setting up sense data (Action 2).

Standards Conformance 1

The Small Computer System Interface is described in standards including several versions and a number of individual documents. The original Small Computer System Interface Standard, X3.131-1986, is referred to herein as SCSI-1. SCSI-1 was revised resulting in the Small Computer System Interface - 2 (X3.131-1994), referred to herein as SCSI-2. The set of SCSI-3 standards are collectively referred to as SCSI-3.

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Standards Conformance

The applicable ANSI standards are as follows:

Automation/Drive Interface – Commands (ADC)INCITS 403-2005

Automation/Drive Interface – Commands (ADC-2) in development

Automation/Drive Interface – Transport Protocol (ADT) INCITS 4062005

Automation/Drive Interface – Transport Protocol - 2 (ADT-2) in development

SCSI-3 Architecture Model (SAM) X3.270:1996

SCSI Architecture Model - 2 (SAM-2) INCITS.366:2003

SCSI Architecture Model - 3 (SAM-3) INCITS 402-2005

SCSI Architecture Model - 4 (SAM-4) in development

SCSI Parallel Interface - 3 (SPI-3) NCITS.336:2000

SCSI-3 Primary Commands (SPC) Status: X3.301:1997

SCSI Primary Commands - 2 (SPC-2) NCITS 351-2001:2001

SCSI Primary Commands - 3 (SPC-3) INCITS 408-2005

SCSI Primary Commands - 4 (SPC-4) in development

SCSI-3 Medium Changer Commands (SMC) NCITS.314:1998

SCSI Medium Changer Commands - 2 (SMC-2) INCITS 382-2004

SCSI Medium Changer Commands - 3 (SMC-3) in development

SCSI-3 Stream Commands (SSC) NCITS 335:2000

SCSI Stream Commands - 2 (SSC-2) INCITS 380-2003

SCSI Stream Commands - 3 (SSC-3) in development

Note: The term SCSI is used wherever it is not necessary to

distinguish between the versions of SCSI.

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LTO Conformance

LTO Conformance 1

Quantum LTO drives conform to the requirements of the Generation 1 SCSI Common Command Set Advisory Document (AU1-SCSI) for Ultrium format devices.

General Behaviors 1

This sections describes the general behaviors of the LTO tape drive.

Reset Condition 1 When a reset is issued to the tape drive, the drive clears all uncompleted

commands, releases all SCSI device reservations, and sets the tape drive to default modes. The Parallel SCSI drive returns to the Bus Free phase.

Unit Attention Condition 1 The Unit Attention condition in the tape drive typically results from the

following conditions:

• A Reset was previusly issued to the drive.

• The drive has just been powered on.

• A cartridge has been inserted.

• A log exception condition occurred.

• The mode pages have been changed.

• The cartridge has been loaded or unloaded to the Hold position, and the Medium Auxiliary Memory (MAM) is accessible.

The Unit Attention Condition persists for each Initiator until that Initiator issues a command other than with a Check Condition Status. If the next command from that Initiator following the Check Condition Status is attention sense key is returned.

If the

INQUIRY command is received from an Initiator with a pending

Unit Attention Condition before the tape drive reports Check Condition

LTO-2 SCSI Interface Guide 17

INQUIRY for which the tape drive returns

REQUEST SENSE, then the unit

Chapter 1 SCSI Interface

General Behaviors

Status, the tape drive performs the INQUIRY Command and does not clear the Unit Attention Condition.

If the

REQUEST SENSE command is received from an Initiator with a

pending Unit Attention Condition before the tape drive reports Check Condition Status, the tape drive reports unit attention sense key and clears the Unit Attention Condition for that Initiator.

Contingent Allegiance Condition

The Contingent Allegiance condition shall exist following the return of Check Condition and may exist following an unexpected disconnect. The

contingent allegiance condition shall be preserved for the I T x nexus until it is cleared. The contingent allegiance condition shall be cleared upon the generation of a hard reset condition or by an Abort message, a Bus Device Reset message, or any subsequent command for the I T x nexus. While the contingent allegiance condition exists the drive shall preserve the sense data for the initiator.

While the contingent allegiance condition exists, the drive shall respond to any other requests for access to the logical unit from another initiator with a Busy status. Execution of queued commands shall be suspended until the Contingent Allegiance condition is cleared.

Buffered Mode 1 Buffered Mode allows the most efficient operation of a tape drive. The

drive defaults to Buffered mode. In this mode, the drive signals Command Complete when all requested data for a Write command has been transferred from the host to the tape drive buffer. This mode provides data to maintain operation while the host readies a new Write Command.

If an error occurs in writing data to the tape after the tape drive signals Command Complete, an error status is sent on the next Command issued.

Immediate Commands 1 For Initiators that do not support the disconnect feature, the Immediate

bit in certain commands provides a means of returning status while the drive is busy completing a function such as repositioning the tape. For the Parallel SCSI interface, this allows the bus to be released. If a command is sent by the Initiator after a previous immediate command was accepted, the drive continues the immediate command it is currently performing and may disconnect, execute, or reject the new command depending on the new command.

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An immediate bit of zero means that the status is returned to the Initiator when the operation is completed. (For example, the status is returned when the tape has been repositioned.) An Immediate bit of one means that the status is returned to the Initiator as soon as the function is started.

Residual Length Function 1 When performing a WRITE command, the drive returns a Good Status

and Command Completion Message when the last byte requested by the command is placed in the Data Buffer, rather than when it is written onto tape. If an error occurs while data is being written onto tape, the drive calculates the Residual Length and places this value in the information bytes of the Sense Data Block. Also, the Residual Length functions for other commands, such as Read.

Residual Length is calculated by: RL = TL - AL

Where:

AL (Actual Length) = Blocks transferred from the host to the tape

drive.

TL (Transfer Length) = The Transfer Length from bytes 2-4 of the Write

command (Request Transfer Length).

RL (Residual Length) = The amount of blocks or bytes not written to

tape.

Early Warning Function 1 Early Warning on the LTO drive is a logical warning given when 64

megabytes of storage space remain on the tape. The position is calculated by the drive. When this physical position is reached on a tape, the following occurs.

1 The command completes with a Check Condition and a 40h Sense

data meaning EOM and no Sense Key.

2 Subsequent WRITE commands write data and complete with check

condition with EOM Status and No Sense Key until the physical tape end is encountered.

Error Reporting 1 Soft errors are generally tape-quality related and occur more frequently

during write operations than during read operations. Soft errors indicate repeated attempts by the drive to read or write data on the tape. Some soft errors are normal, but an increase in the usual count can indicate

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General Behaviors

deteriorating tape quality. If the soft error count remains higher than normal, use a cleaning cartridge to clean the read/write heads. If this procedure does not clear the problem, change to a new tape cartridge.

If a hard error (unrecoverable error) occurs during operation, the drive terminates operation immediately and returns a Check Condition. The Initiator should cease any further read or write functions and issue a

REQUEST SENSE command to determine the type of error.

When the drive detects a write error, it attempts to rewrite the data up to 128 times.

After the 128th attempt, the error is considered unrecoverable and the operation terminates. When a hard error is encountered, replace the tape with a new cartridge and repeat the function or clean the heads with a cleaning cartridge.

Variable and Fixed Mode Recording

The LTO drive can write either fixed or variable block sizes. The recording mode is determined by the Fixed bit in the SCSI

READ commands.

If the Fixed bit is set, the

MODE SELECT command sets the size of the next

WRITE and

block or multiple blocks to be written with the next Write command. When a Write command is issued with the Fixed bit set, the current block size is implemented. The transfer length specifies the number of blocks to be written with this size. If a Write command is issued with the Fixed bit set and the current block size set to 0, the LTO drive returns a Check Condition with Illegal Request Sense Key. When writing with the Fixed bit set, each Write command specifies the number of contiguous blocks to be written of a fixed size, resulting in fixed-mode blocks. If the Fixed bit is reset, then only one block can be written on the tape per SCSI Write command CDB. In that case, the Write command CDB transfer length specifies the size of the block to be written in bytes. With the Fixed bit reset, the current block size specified with the last

MODE SELECT

command is ignored.

Setting the block size to 0 in the Mode Select page descriptor is not required. Therefore, with the Fixed bit reset, each SCSI

WRITE command

may specify a different byte count, resulting in variable-mode blocks.

The host may switch between fixed and variable mode recording. By issuing the

MODE SELECT command to specify different block sizes,

blocks can be written to the tape with different block sizes in the fixed mode. Also, the host may change the block size after BOM, allowing onthe-fly block-size changes.

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General Behaviors

The READ command fixed bit also specifies fixed or variable mode. When reading in variable mode, the host must know the size of the block to be read from the tape in advance in order to avoid causing the LTO drive to return a Check Condition with Incorrect Length indicated in the Sense data (ILI). Also, the data transfer may be truncated (cut off) when the recorded block does not match the transfer length in variable mode or the current block size in fixed mode.

The

READ command includes a SILI bit to Suppress ILI Check conditions.

When the SILI bit is set, the host usually specifies the maximum block size before reading so that the data blocks are not truncated, and no Check Conditions are generated.

The SCSI

READ BLOCK LIMITS command returns the minimum and

maximum block sizes that the LTO drive can support. The Block Limits data is not modified to reflect the current mode of writing-fixed or variable. The Block Limits returned data is not modified to reflect the current block size for the next fixed-mode Write. The

MODE SENSE

command is used for that purpose.

Library Features 1 This section describes featues available in libraries that support LTO tape

drives.

Auto Unload Mode

The LTO drive has an Auto Unload Mode that may be accessed via a Mode command to Mode Page 21h. The purpose of the Auto Unload mode is to allow the drive to be configured to work in Library systems or as a standalone drive. The Auto Unload mode allows the drive to control how the tape is unloaded in “automatic” type situations. There are four possible Auto Unload modes:

• Do Nothing - Stay threaded at BOT (mode 0).

• Unthread Only (mode 1).

• Unthread and unload (mode 2).

• Unthread and unload non data cartridges, data cartridges go to BOT (mode 3). Basically data cartridges behave as for mode 0 and non data cartridges behave according to mode 2.

Here are the possible “automatic” situations where the ejection process will be controlled using the Auto Unload mode. As shown in the list

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General Behaviors

below, this covers not only power on situations, but also how cleaning tapes, incompatible tapes and firmware tapes are handled.

• Powering on or power cycling while the tape is inside the drive.

• Cleaning tape has finished the cleaning cycle.

• Unsupported data tape has been loaded.

• Unsupported cleaning tape has been loaded.

• Microcode download from a firmware tape.

• Microcode download via the SCSI Write Buffer command while a tape is loaded.

Host Unload Override

The LTO drive has a Host Unload Override mode that may be accessed via a Mode command to Mode Page 21h. The purpose of the Host Unload Override mode is to allow the Library system to set the drive into a mode where the drive will not eject the cartridge should the host issue a SCSI

UNLOAD command. A SCSI UNLOAD command from the host will cause

the tape to be unthreaded but the cartridge will remain in the drive. The Library

UNLOAD command will cause the cartridge to be ejected.

ID Modification

Tape libraries require the ability to change the SCSI ID of installed tape drives without opening the library and changing address jumpers. To change the SCSI ID of the LTO drive, issue a

MODE SELECT command to

Mode Page 22h to change the Next Selection ID field to the desired ID. Then reset or power cycle the drive, and it will begin responding to the new ID. This new ID will persist through additional resets and power cycles.

If the address jumpers are changed and the drive's power is cycled, the drive will respond to the new address on the jumpers. The value in the Next Selection ID field will be that on the jumpers, even though the field may have been changed immediately before the power cycle.

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General Behaviors

LUN 1 Command Forwarding 1

A tape library or autoloader containing a LTO can receive its SCSI commands via the LTO drive. This function is called "Command Forwarding" and is enabled via the "CmdFwd" field in the Interface Control mode page (22h). When enabled, commands received via the SCSI bus and addressed to LUN 1 are immediately transmitted to the library via the RS-422 interface. LTO acts as a bridge, passing commands, data, and status between the initiator and the library, as specified in the Library Interface Encapsulated SCSI Protocol Manual.

In SCSI Medium Changer terminology, the library or autoloader appears as an "independent medium changer," because the tape drive and medium changer are at different LUNs. Medium changer commands addressed to LUN 0 are rejected with Check Condition and sense data of Illegal Request / Invalid Command Operation Code (05/20/00).

In the Parallel SCSI drive, because of the relatively slow communication on the RS-422 interface, LTO will disconnect from the SCSI bus after receiving a command, after receiving data-out, and after sending status. Data-in and status are sent to the initiator without disconnecting between them.

If the link fails between the LTO and the library, the failed command will receive a status of Check Condition and sense data of Aborted Command / Logical Unit Communication Failure (0B/08/00).

If a SCSI bus reset or a Target Reset task management request is received, then either a Target Reset or Logical Unit Reset task management request is transmitted to the library. The library must be capable of processing either request.

When command forwarding is disabled in mode page 22h, commands addressed to LUN 1 will receive a status of Check Condition and sense data of Illegal Request / Logical Unit Not Supported (05/25/00).

After Command Forwarding is enabled or disabled, the drive will respond to the next command with a Check Condition and sense data of Unit Attention / Reported LUNs Data Has Changed (06/3F/0E).

LTO-2 SCSI Interface Guide 23

Chapter 2

2SCSI Commands

This chapter describes the supported SCSI commands implemented in the LTO-2 tape drive. This chapter does not fully reiterate the entire ANSI SCSI standards; for information of this nature, refer to the SCSI standard itself.

The Web sites information.

www.scsita.org and www.t10.org are also helpful sources of

Command Set 2

The following table shows the SCSI commands for sequential access devices implemented by the drive.

Table 9 SCSI Command Set

Group Code Command Page

000h

001h

003h

005h

TEST UNIT READY REWIND REQUEST SENSE READ BLOCK LIMITS

265

247

215

177

LTO-2 SCSI Interface Guide 24

Chapter 2 SCSI Commands

Command Set

Group Code Command Page

006h

008h

00Ah

00Bh

010h

011h

012h

013h

015h

016h

017h

019h

01Ah

01Bh

PARK UNPARK READ WRITE SET CAPACITY WRITE FILEMARKS SPACE INQUIRY

VERIFY

MODE SELECT(6)

RESERVE UNIT

RELEASE UNIT

ERASE

MODE SENSE(6)

LOAD UNLOAD

162

167

272

256

281

260

268

119

243

201

151

01Ch

01Dh

01Eh

12Bh

134h

13Bh

13Ch

LTO-2 SCSI Interface Guide 25

RECEIVE DIAGNOSTIC RESULTS

SEND DIAGNOSTIC PREVENT ALLOW

MEDIUM REMOVAL LOCATE

READ POSITION WRITE BUFFER READ BUFFER

194

250

164

187

276

180

Chapter 2 SCSI Commands Command Descriptor Blocks

Group Code Command Page

244h

24Ch

24Dh

255h

256h

257h

25Ah

3A0h

REPORT DENSITY SUPPORT

LOG SELECT LOG SENSE

MODE SELECT(10) RESERVE UNIT

RELEASE UNIT

MODE SENSE(10) REPORT LUNS 211

205

119

243

201

151

Command Descriptor Blocks 2

A host makes a request of the tape drive by sending a Command Descriptor Block (CDB). Some commands also require a parameter list. If the CDB or the parameter list contains an invalid parameter, the drive terminates the command, returning a Sense Key of Illegal Request, without altering the medium.

This chapter covers the following topics:

• Command Descriptor Block Formats

• Operation Code Format

• Control Byte Format

Command Descriptor Block Formats

LTO-2 SCSI Interface Guide 26

SCSI 6-byte Command Descriptor Blocks are arranged in the format shown in table 10

. The position and length of each field is indicated by

the Byte and Bits columns in the Field Descriptions table (see table 12

Chapter 2 SCSI Commands Command Descriptor Blocks

Table 10 SCSI 6-Byte Command Descriptor Block Data Format

Table 11 SCSI 10-Byte Command Descriptor Block — Data Format

Bit

7 6 5 4 3 2 1 0

Byte

0 Operation Code 1 Ignored LUN Command Dependent 2 Command Dependent 3 Command Dependent 4 Command Dependent 5 Control

SCSI 10-byte Command Descriptor Blocks are arranged in the format shown in table 11 Byte and Bits columns in the Field Descriptions table (see table 12

. The position and length of each field is indicated by the

Bit

7 6 5 4 3 2 1 0

Byte

0 Operation Code 1 Ignored LUN Command Dependent 2 Command Dependent 3 Command Dependent 4 Command Dependent 5 Command Dependent 6 Command Dependent 7 Command Dependent 8 Command Dependent 9 Control

LTO-2 SCSI Interface Guide 27

Chapter 2 SCSI Commands Command Descriptor Blocks

T able 12 Command Descriptor Block — Field Descriptions

Field Byte Bits Description

Operation Code

0 The Operation Code is made up

of the Group Code and the Command Code (see table 13

Ignored Logical Unit

1 5-7 The LUN field is vestigial from

the SCSI-1 standard and is ignored.

Command Dependent

2-4 or

0-4 See the specific command.

2-8

Reserved All reserved bits must be 0.

Control Last The Control byte is made up of

the Vendor Unique, Flag and Link bits. See Control Byte

Format on page 29.

Fields that are one byte or longer have no entry in the Bits column.

Operation Code Format 2 The Operation Code is composed of the Group Code and Command

Table 13 Operation Code Format — Data Format

Code (see table 13

Bit

and table 14).

7 6 5 4 3 2 1 0

Byte

0 Group Code Command Code

Table 14 Operation Code Format—Field Descriptions

Field Byte Bits Description

Group Code 0 5-7 The SCSI command group.

Command Code 0 0-4 The SCSI command code.

LTO-2 SCSI Interface Guide 28

Control Byte Format 2 The Control Byte is the last byte in any CDB.

Chapter 2 SCSI Commands Command Descriptor Blocks

Table 15 Control Byte Format

Table 16 Control Byte Format —Field Descriptions

Bit

7 6 5 4 3 2 1 0

Byte

Last

Vendor Unique

Reserved

NACA

Flag Link

Field Byte Bits Description

Vendor

Last 6-7 Not used, always 0.

Unique

Reserved Last 3-5 All reserved bits must be 0.

NACA Last 2 Not supported; reserved.

Flag Last 1 This bit is not supported by the LTO

drive.

Link Last 0 This bit is not supported by the LTO

drive.

LTO-2 SCSI Interface Guide 29

Chapter 2 SCSI Commands

Command Status

Command Status 2

When the tape drive competes a command it responds with a status byte. The format of the status byte is shown below.

Table 17 Status Byte Format

Table 18 Status Byte Field Descriptions

Bit

Byte

Field Byte Bits Description

Reserved 0 6-7 Always 0

Status Code

7 6 5 4 3 2 1 0

Reserved Status Code

0 0-5 The command status, as defined in table

19.

LTO-2 SCSI Interface Guide 30

Chapter 2 SCSI Commands

Command Status

Table 19 Status Codes

Description Value When returned

Good Status 00h The command completed

without problems.

Check Condition 02h A problem occurred during

command execution. The sense data should be examined to determine the nature of the problem.

Busy 08h The drive is unable to accept

the command at this time. This is only returned during the power-on sequence or if there are commands from too many initiator ports outstanding.

Reservation Conflict 18h The drive is reserved for an

initiator port other than the one sending the command.

LTO-2 SCSI Interface Guide 31

Chapter 2 SCSI Commands

ERASE Command

ERASE Command 2

The ERASE command marks the tape, from the current position to the end of tape, as erased.

Table 20 ERASE Command Descriptor Block — Data Format

Table 21 ERASE Command Descriptor Block — Field Descriptions

Bit

7 6 5 4 3 2 1 0

Byte

0 Operation Code (19h) 1 Ignored LUN Reserved

Immed

Long

2 Reserved 3 Reserved 4 Reserved 5 Control

Field Bytes Bits Description

Operation Code

Ignored Logical Unit

0 The Operation Code for

ERASE is

19h.

1 5-7 The LUN field is vestigial from the

SCSI-1 standard and is ignored.

Immed 1 1 0 = Status is not returned until the

tape is erased.

1 = Status is returned as soon as the operation is initiated.

LTO-2 SCSI Interface Guide 32

Chapter 2 SCSI Commands

ERASE Command

Field Bytes Bits Description

Long 1 0 0 = Short Erase is performed and

EOD is recorded at the current tape position.

1 = Long data-security Erase is performed, and EOD is recorded from the current tape position to the end of the tape.

Reserved All reserved bits must be 0.

Control See Control Byte Format on

page 29.

If the Immediate (Immed) flag is set to 1, then the drive validates the command and waits for any previous command from any host to complete including any immediate commands currently being processed and for any buffered data to be flushed to tape. It will then report a deferred error for any preceding command or buffered data if appropriate. If there is no deferred error, the drive reports good status and initiates the command. If the Immediate (Immed) flag is set to 0, status is not returned until after the command has completed.

If the Long bit is set, EOD is written at the current position. Data Set Separators are then written from EOD to the end of the medium to overwrite any data currently on the tape. If the Long bit is clear, then an EOD is written at the current position marking it as end of data.

Completion Status 2 Table 22 shows the completion codes and messages for the ERASE

command.

LTO-2 SCSI Interface Guide 33

Chapter 2 SCSI Commands

ERASE Command

Table 22 ERASE Command Completion Status

Code Message Description

00h Good Status • The drive remains in any previously

set modes.

• The drive is ready to perform any appropriate command.

Note: If Immed is 1, then Good Status

only indicates that the command is valid.

02h Check

Condition

Use the

REQUEST SENSE command to

retrieve status information. Possible Sense Keys are:

Code Message Description

02h Not Ready No cartridge is in

the drive.

03h Media Error Unrecoverable

data error encountered.

04h Hardware

Error

Parity error on the SCSI bus or drive hardware failure.

05h Illegal

Request

Both the Immediate bit and the Link bits are 1, or the Command Descriptor Block is invalid.

LTO-2 SCSI Interface Guide 34

Code Message Description

Chapter 2 SCSI Commands

ERASE Command

06h Unit

Attention

07h Write

Protect

The cartridge was changed, or the drive was reset prior to this command.

The tape is writeprotected.

LTO-2 SCSI Interface Guide 35

Chapter 2 SCSI Commands

INQUIRY Command

INQUIRY Command 2

The INQUIRY command requests that the drive return information about itself. If an pending Unit Attention Condition (before the drive reports Check Condition status), the drive performs the not clear the Unit Attention Condition.

INQUIRY command is received from an Initiator with a

INQUIRY command and does

Table 23 INQUIRY Command Descriptor Block — Data Format

Table 24 INQUIRY Command Descriptor Block — Field Descriptions

Field Bytes Bits Description

Operation Code

Ignored Logical Unit

Bit

7 6 5 4 3 2 1 0

Byte

0 Operation Code (12h) 1 Ignored Reserved

CmdDt

EVPD

2 Page or Operation Code 3 Reserved 4 Allocation Length 5 Control

0 The Operation Code for

INQUIRY is 12h.

1 5-7 The LUN field is vestigial from the SCSI-1 standard and

is ignored.

CmdDt 1 1 Command Support Data (CmdDt) bit

0 = Requests Inquiry data

1 = Requests command support data specified by operation code.

LTO-2 SCSI Interface Guide 36

Chapter 2 SCSI Commands

INQUIRY Command

Field Bytes Bits Description

EVPD 1 0 Enable Vital Product Data (EVPD) bit

0 = Requests Standard Inquiry Data.

1 = Requests data page specified by the Page Code.

Page Code 2 00h = Requests Supported Vital Product Data Page

80h = Requests Unit Serial Number Page

83h = Requests Device Identification Page

C0h = Requests SCSI Firmware Revision Page

C1h = Requests Servo Firmware Revision Page

C2h = Requests Head Assembly Serial Number Page

C3h = Requests Reel Motor 1 Serial Number Page

C4h = Requests Reel Motor 2 Serial Number Page

C5h = Requests Board Serial Number Page

C6h = Requests Base Mechanical Serial Number Page

DFh = Requests Drive Status Page

Operation Code

Allocation Length

2 Command Descriptor Block operation code when

CmdDt is set to one.

4 Specifies the amount of data to be returned, in bytes. A

value of 0 is a valid entry and returns no data.

The drive transfers the number of bytes specified up to a maximum of 38h for Standard Inquiry.

Reserved All reserved bits must be 0.

Control 5 See Control Byte Format on page 29

If the Enable Vital Product Data (EVPD) and Command Support Data (CmdDt) bits are clear and the Page Code is zero, Standard Inquiry Data is returned (see Standard Inquiry Data Page

on page 38).

If the Enable Vital Product Data (EVPD) flag is set and the Page Code is zero, the Supported Vital Product Data Pages page is returned (see

Supported Vital Product Data (VPD) Page (00h)

LTO-2 SCSI Interface Guide 37

on page 42).

Chapter 2 SCSI Commands

INQUIRY Command

If both EVPD and CmdDt are set then the drive will return CHECK CONDITION status with a sense key of ILLEGAL REQUEST.

If CmdDt is set and EVPD is clear then the drive will return the Command Support Data for the specified operation code (see Command

Support Data on page 59).

If the EVPD flag is set and the Page Code is not zero and there is a vendor defined Inquiry Data Page corresponding to that page code, then that page is returned. Otherwise, Check Condition status is returned. The Sense Key is set to Invalid Request (5) and the additional Sense to Invalid Field in CDB (2400).

Standard Inquiry Data Page

The INQUIRY command returns Standard Inquiry Data in the format shown in table 25

The Standard Inquiry Data is based on the SCSI 3 standard for Standard Inquiry Data. This allows for setting certain bits in byte 6 to indicate features that were non-standard in SCSI 2. The only supported SCSI 3 field is Multi Port (MultiP).

The Multi-Port (MultiP) flag is set if the device has multiple interface ports. Parallel SCSI devices do not have multiple interface ports and have this flag clear.

The 16 Bit Address (Addr16) and Wide Bus 16 (WBus16) flags are set depending on whether the hardware supports these bus features. These flags are only valid for Parallel SCSI and are clear for all other interfaces.

LTO-2 SCSI Interface Guide 38

Table 25 Standard Inquiry Data Page — Data Format

Chapter 2 SCSI Commands

INQUIRY Command

Byte

16-31

32-35

36-55

8-15

Bits

7 6 5 4 3 2 1 0

Peripheral Qualifier Peripheral Device Type

RMB Reserved

Version

AERC Obsolete NACA HiSup Response Data Format

Additional Length

Reserved

BQue EncServ VS MultiP MChgr Obsolete Obsolete Addr16

RelAdr Obsolete WBus16 Sync Linked TransDis CmdQ VS

Vendor Identification

Product Identification

Product Revision Level

Vendor Specific

58-73

LTO-2 SCSI Interface Guide 39

Reserved Clocking QAS IUS

Reserved

Version Descriptors

Table 26 Standard Inquiry Data Page — Field Descriptions

Field Bytes Bits Description

Chapter 2 SCSI Commands

INQUIRY Command

Peripheral

0 5-7 Always 000b.

Qualifier

Peripheral Device Type

0 0-4 Normally 01h to indicate a sequential access device.

7Fh indicates that a logical unit is not present. This value is returned when an invalid LUN was in the last Identify message.

RMB 1 7 Always 1, indicating Removable Media.

Version 2 Always 3

AERC 3 7 Always 0, indicating Asynchronous Event Reporting Capability is

not supported.

NACA 3 5 0 = Normal ACA (NACA) is not supported

HiSup 3 4 Always 0, indicating Hierarchical Support is not supported.

Response Data Format

Additional Length

3 0-3 Always 2, indicating support of the standard that the version

indicates.

4 Always 45h, indicating that 69 bytes of additional

INQUIRY command

parameters follow, beginning in Byte 5. This value does not change if the Allocation Length in the CDB is too small or too large to accommodate the entire response.

BQue 6 7 0 = Basic Queuing is not supported

EncServ 6 6 Always 0, indicating Enclosure Services is not supported.

VS 6 5 Always 0, indicating this feature is not supported.

MuiltiP 6 4 0 = Multiple Interface Ports not available

MChgr 6 3 Always 0, indicating Medium Changer is not supported.

Addr16 6 0 1 = 16 Bit Address supported

RelAdr 7 7 Always 0 because Relative Addressing is not supported.

WBus16 7 5 1 = Wide Bus16 supported

LTO-2 SCSI Interface Guide 40

Chapter 2 SCSI Commands

INQUIRY Command

Field Bytes Bits Description

Sync 7 4 1 = Synchronous Transfer is supported

Linked 7 3 Always 0, indicating Linked Command is not supported.

CmdQue 7 1 0 = Command queuing is not supported

1 = Command queuing is supported

VS 7 0 Always 0, indicating this feature is not supported.

Vendor

8-15 8 bytes of ASCII data: “CERTANCE”.

Identification

Product

16-31 16 bytes of ASCII data: “ULTRIUM 2“ followed by 7 spaces.

Identification

Product

32-35 4 bytes of ASCII data indicating the SCSI firmware version. Revision Level

Vendor

36-55 This field may contain additional vendor specific information. Specific

Clocking 56 2-3 Always 3, indicating that single transition and double transition are

supported.

QAS 56 1 Always 0, indicating that quick arbitration and selection are not

supported.

IUS 56 0 Always 0, indicating that information unit transfers are not

supported.

Version Descriptors

58-73 8 sets of 2-byte descriptors indicating conformance to up to eight

standards. Reference SPC-3 for a listing of descriptor values.

Obsolete Always 0

Reserved Always 0

LTO-2 SCSI Interface Guide 41

Chapter 2 SCSI Commands

INQUIRY Command

Supported Vital Product Data (VPD) Page (00h)

Table 27 Supported Vital Product Data Inquiry Page — Data Format

The Supported Vital Product Data Page lists the following eleven VPD pages including itself:

• Supported Vital Product Data (VPD) Page (00h)

• Unit Serial Number Page (80h)

• Device Identification Page (83h)

• Drive Component Revision Levels Pages (C0h, C1h)

• Drive Component Serial Number Page (C2, C3, C4, C5, C6h)

• Drive Status Page (DFh)

Bits

Byte

7 6 5 4 3 2 1 0

Peripheral Qualifier Peripheral Device Type

Page Code

Reserved

Page Length

LTO-2 SCSI Interface Guide 42

Supported Vital Product Data Page Code

Unit Serial Number Page Code

Device Identification Page Code

SCSI Firmware Revision Page Code

Servo Firmware Revision Page Code

Head Assembly Serial Number Page Code

Reel Motor 1 Serial Number Page Code

Reel Motor 2 Serial Number Page Code

Board Serial Number Page Code

Chapter 2 SCSI Commands

INQUIRY Command

Table 28 Supported Vital Product Data Inquiry Page — Field Descriptions

Bits

Byte

7 6 5 4 3 2 1 0

Base Mechanical Serial Number Page Code

Drive Status Page Code

Field Bytes Bits Description

Peripheral

0 5-7 Always 000b.

Qualifier

Peripheral Device Type

0 0-4 Normally 01h to indicate a

sequential access device.

7Fh indicates that a logical unit is not present. This value is returned when an invalid LUN was in the last Identify message, or the LUN field of the Identify CDB.

Page Code 1 Always 0, indicating the

Supported Vital Product Data Inquiry Page

Reserved 2 Always 0

Page Length 3 Always 0Bh to indicate 11 listed

pages.

Supported Vital Product Data Page Code

Unit Serial Number Page

4 Always 00h, the page code of the

Supported Vital Product Data Inquiry Page

5 Always 80h, the page code of the

Unit Serial Number Page

Code

Device Identification

6 Always 83h, the page code of the

Device Identification Page

Page Code

LTO-2 SCSI Interface Guide 43

Chapter 2 SCSI Commands

Field Bytes Bits Description

INQUIRY Command

SCSI Firmware Revision Page Code

Servo Firmware Revision Page Code

Head Assembly Serial Number Page

Reel Motor 1 Serial Number Page

Reel Motor 2 Serial Number Page

Board Serial Number Page

Base Mechanical Serial Number Page

7 Always C0h, the page code of the

SCSI Firmware Revision Page

8 Always C1h, the page code of the

Servo Firmware Revision Page

9 Always C2h, the page code of the

Head Assembly Serial Number Page.

10 Always C3h, the page code of the

Reel Motor 1 Serial Number Page.

11 Always C4h, the page code of the

Reel Motor 2 Serial Number Page.

12 Always C5h, the page code of the

Board Serial Number Page.

13 Always C6h, the page code of the

Base Mechanical Serial Number Page.

Unit Serial Number Page (80h)

Drive Status Page

The Unit Serial Number Page contains a single value, which is a 12-byte ASCII string. The string, with the Vendor Identification and Product

14 Always DFh, the page code of the

current drive and cartridge state.

Identification fields in the Standard Inquiry Data, uniquely identifies the drive.

LTO-2 SCSI Interface Guide 44

Chapter 2 SCSI Commands

INQUIRY Command

Table 29 Unit Serial Number Page (80h) — Data Format

Table 30 Unit Serial Number Page (80h) — Field Descriptions

Bit

7 6 5 4 3 2 1 0

Byte

0 Peripheral Qualifier Peripheral Device Type 1 Page Code 2 Reserved 3 Page Length

4—15 Drive Serial Number

Field Bytes Bits Description

Peripheral

0 5-7 Always 000b.

Qualifier

Peripheral Device Type

0 0-4 Normally 01h to indicate a sequential

access device.

7Fh in byte 0 indicates that a logical unit is not present. This value is returned when an invalid LUN is specified.

Page Code 1 Always 80h, indicating the Unit Serial

Number Page

Reserved 2 Always 0

Page Length

Drive Serial

3 Always 0Ch to indicate 12 additional

bytes of data.

4-15 12 bytes of ASCII data giving the unit

serial number.

Number

Device Identification Page (83h)

LTO-2 SCSI Interface Guide 45

The Device Identification Page contains one or more device identification descriptors that uniquely identify the particular device.

Chapter 2 SCSI Commands

INQUIRY Command

Table 31 Device Identi fication Page (83h) — Data Format

Table 32 Device Identification Page (83h) — Field Descriptions

Bits

Byte

4-...

...-...

7 6 5 4 3 2 1 0

Peripheral Qualifier Peripheral Device Type

Page Code

Reserved

Page Length

Identification Descriptor

...

Identification Descriptor

Field Bytes Bits Description

Peripheral

0 5-7 Always 000b.

Qualifier

Peripheral Device Type

0 0-4 Normally 01h to indicate a sequential

access device. 7Fh indicates that a logical unit is not present. This value is returned when an invalid LUN is specified.

Page Code 1 Always 83h, indicating the Device

Identification Page

Reserved 2 Always 0

Page Length 3 n-3, indicating the total length of all

Identification Descriptors following.

Identification Descriptor

LTO-2 SCSI Interface Guide 46

4-n One or more Identification Descriptor

(see table 33

and table 34).

Chapter 2 SCSI Commands

INQUIRY Command

Table 33 Identification Descriptor — Data Format

Table 34 Identification Descriptor — Field Descriptions

Bits

Byte

4-n

7 6 5 4 3 2 1 0

Reserved Code Set

Reserved Association Identifier Type

Reserved

Identifier Length

Identification Descriptor

Field Bytes Bits Description

Code Set 0 0-3 1 = Identification Descriptor

contains binary data.

2 = Identification Descriptor contains ASCII data.

Identifier Type

1 0-3 1 = Identification Descriptor is

Vendor ID and Product ID from Standard Inquiry Data Page, followed by Serial Number from the Unit Serial Number Page.

2 = Identification Descriptor is an IEEE Extended Unique Identifier.

4 = Relative target port (4 bytes)

Association 1 4-5 0 = Identifier field is associated with

the addressed physical or logical device.

1 = Identifier field is associated with the port that received the request.

Identifier Length

LTO-2 SCSI Interface Guide 47

3 n-3, indicating the length of this

Identification Descriptor.

Field Bytes Bits Description

Chapter 2 SCSI Commands

INQUIRY Command

Drive Component Revision Levels Pages (C0h, C1h)

Table 35 Drive Component Revision Levels Pages (C0h, C1h) — Data Format

Identification Descriptor

4-n Binary or ASCII data (depending on

Code Set).

Reserved Always 0.

The Drive Component Revision Levels Pages contain details of the revisions of each of the components of the drive. For any given product, if these pages are the same then the drive has been built with the same

components and with the same manufacturing process.

Bits

Byte

7 6 5 4 3 2 1 0

Peripheral Qualifier Peripheral Device Type

Page Code

Page Length

Component

4-29

30-48

49-72

73-95

LTO-2 SCSI Interface Guide 48

Version

Date

Variant

Chapter 2 SCSI Commands

INQUIRY Command

Table 36 Drive Component Revision Levels Pages (C0h, C1h) — Field Descriptions

Field Bytes Bits Description

Peripheral

0 5-7 Always 000b.

Qualifier

Peripheral Device

0 0-4 01h, indicating a sequential access

device.

Type

Page Code 1 C0h = SCSI Firmware Revision Page

C1h = Servo Firmware Revision Page

Reserved 2 Always 0

Page

3 Always 5Ch

Length

Component 4-29 26 bytes of ASCII data, identifying the

component.

“SCSI FIRMWARE“ = SCSI Firmware Revision Page

“SERVO FIRMWARE“ = Servo Firmware Revision Page

Version 30-48 19 bytes of ASCII data, “VNNNN-

MMM”

Date 49–72 24 bytes of ASCII data,

“YYYY/MM/DD”

YYYY = 4 digits of year

MM = 2 digits of month

DD = 2 digits of day

Variant 73–95 23 bytes of ASCII data

LTO-2 SCSI Interface Guide 49

Chapter 2 SCSI Commands

INQUIRY Command

Drive Component Serial Number Page (C2, C3, C4, C5, C6h)

Table 37 Drive Component Serial Number Page (C2, C3, C4, C5, C6h) — Data Format

Table 38 Drive Component Serial Number Page (C2, C3, C4, C5, C6h) —Field Descriptions

The Drive Component Serial Number Page contains a single value, which is a 12 byte ASCII string. The string, with the drive component fields in the standard Inquiry data, uniquely identifies the component.

Bits

Byte

4-15

7 6 5 4 3 2 1 0

Peripheral Qualifier Peripheral Device Type

Page Code

Reserved

Page Length

Component Serial Number

Field Bytes Bits Description

Peripheral

0 5-7 Always 000b.

Qualifier

Peripheral Device

0 0-4 Normally 01h to indicate a sequential

access device.

Type

Page Code 1 C2h, indicating the Head Assembly

Serial Number Page

C3h, indicating the Reel Motor 1 Serial Number Page

C4h, indicating the Reel Motor 2 Serial Number Page

C5h, Board Serial Number Page

C6h, Base Mechanical Serial Number Page

LTO-2 SCSI Interface Guide 50

Field Bytes Bits Description

Reserved 2 Always 0

Chapter 2 SCSI Commands

INQUIRY Command

Page Length

Drive Serial Number

3 Always 0C to indicate 12 additional

bytes of data.

4-15 12 bytes of ASCII data giving the unit

serial number.

LTO-2 SCSI Interface Guide 51

Chapter 2 SCSI Commands

INQUIRY Command

Drive Status Page (DFh) 2 The Drive Status Page provides a snapshot of the current state of the

drive and cartridge. It provides an extract of selected mode and log pages. The page code is DFh.

Table 39 Drive Status Page (DFh) — Data Format

Bits

Byte

7 6 5 4 3 2 1 0

0 Peripheral Qualifier Peripheral Device Type

1 Page Code

2 Reserved

3 Page Length

4 Drive State

CmdFwd Alerts Rsvd

Reserved

Threaded

NoRem

Lun1-

Cmd

Unit

Rsvd

7 Reserved

8 Cartridge Type

9 Cartridge Format (0)

Rsvd Clean

Autoload Mode

10 Cartridge Capacity, MSB

11 Cartridge Capacity, LSB

12 Port A Transport Type

13 Reserved

14 Reserved

LTO-2 SCSI Interface Guide 52

Chapter 2 SCSI Commands

INQUIRY Command

Bits

Byte

7 6 5 4 3 2 1 0

15 Port A Selection ID

16 Reserved

17 Reserved

Reserved

(MSB)

20–23

24-31

32-63

Table 40 Drive Status Page (DFh) — Field Descriptions

Field Bytes Bits Description

Operating Hours Since Manufacture

Initiator ID

Cartridge Serial Number

(LSB)

Peripheral

0 5-7 Always 000b.

Qualifier

Peripheral Device

0 0-4 01h, indicating a sequential access

device.

Type

Page Code 1 Always DFh, indicating the Drive

Status Page

Page

3 Always 3Ch

Length

Drive State 4 Contains one of the values shown in

the Drive State Field Values table below.

LTO-2 SCSI Interface Guide 53

Chapter 2 SCSI Commands

INQUIRY Command

Field Bytes Bits Description

Cmd Fwd 5 6-7 0 = Command Forwarding is disabled.

1 = Command Forwarding is enabled.

Command Forwarding is controlled by the Interface Control Mode Page

Alerts 5 5 Lun1Cmd indicates that the drive has

received a command over the primary interface that is addressed to LUN 1. This field will contain a value of 1 until the Forwarded Command packet has been transmitted to the library and the packet acknowledgement byte received. If multiple commands have been received — such as untagged commands from multiple initiators — the field will remain 1 until all Forwarded Command packets have been transmitted. If CmdFwd is zero, then Lun1Cmd will always be zero, as commands to LUN 1 are rejected by the drive.

0 = Alerts are disabled.

1 = Alerts are enabled. (Alerts are not implemented, so this field never has a value of 1.)

Alerts would be controlled by the Interface Control Mode Page.

NoRemov 5 3 0 = Removal of the cartridge is enabled

1 = Removal of the cartridge has been disabled with the

MEDIUM REMOV AL

LTO-2 SCSI Interface Guide 54

PREVENT ALLOW

command.

Chapter 2 SCSI Commands

INQUIRY Command

Field Bytes Bits Description

Unit Rsvd 5 2 0 = The unit is not reserved. The

Initiator Selection Address field is invalid.

1 = An initiator has reserved the device. The Initiator Selection Address field contains the Selection Address of the initiator.

Clean 5 0 0 = Cleaning is not needed.

1 = Cleaning is needed.

Threaded 6 4 0 = Tape is not threaded.

1 = Tape is threaded. (It may still be wrapping and not yet ready.)

Lun1Cmd 6 3 0 = No unforwarded command exists

for LUN 1.

1 = One or more LUN 1 commands are awaiting forwarding via RS-422.

Autoload Mode

6 2-0 0 = Load and thread when cartridge is

inserted.

1 = Load and do not thread when cartridge is inserted.

2 = Do not load when cartridge is inserted.

Autoload Mode is controlled by the Control Mode Page.

Cartridge Type

Cartridge Format

Cartridge Capacity

LTO-2 SCSI Interface Guide 55

8 Contains one of the values shown in

the “Cartridge Type Field Values” table (see table 42

9 Always 0, indicating an LTO tape

cartridge.

10-11 Uncompressed capacity of the

cartridge, in multiples of 10

bytes.

Field Bytes Bits Description

Chapter 2 SCSI Commands

INQUIRY Command

Port A Transport Type

Port A Selection

12 0 = Port A link is down.

3 = Parallel SCSI Ultra-160 interface

15 The SCSI ID to which the drive

responds.

Operating Hours

20-23 Total number of hours of head-tape

contact time. Since Manufacture

Initiator ID 24-31 Identification of the initiator holding a

reservation on the drive, when the Unit

Rsvd field is 1. The least-significant

byte contains the initiator’s SCSI ID. If

Unit Rsvd is zero, then this field is

zero.

Cartridge Serial Number

32-63

32 bytes of ASCII data, right-filled with

blanks. This is the cartridge serial

number as defined by attribute

number 0201h of the SPC-2

ATTRIBUTE

command (the READ command is not

READ

supported).

Reserved Always 0.

a.As there is only one LTO format defined at this time, the Cartridge Format value is always zero. During insertion, data cartridge type is unknown between the time the cartridge is seated and the drive completes winding to BOT; the length calculation takes place during winding.

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Chapter 2 SCSI Commands

INQUIRY Command

Drive State Field Values 2 The Medium Auxiliary Memory (MAM) can be accessed only in the states

indicated.

Table 41 Drive State Field Values

MAM

Value State Description

Accessible?

0 DRIVE NOT READY No commands may be issued and

cartridge may not be inserted.

1 DRIVE EMPTY READY No cartridge in drive. Commands

will be accepted and a cartridge may be inserted.

2 DRIVE MEDIA LOADABLE Cartridge is in carrier and loading

may be initiated by issuing a SCSI

LOAD or a library LOAD CARTRIDGE

command.

3 DRIVE LOADING Drive is loading and threading the

cartridge.

4 DRIVE LOADED HOLD Drive is loaded to Hold point. Y

5 DRIVE LOADED READY Drive can accept non-status

commands.

6 DRIVE WRITING Drive can accept only status and

UNLOAD commands.

7 DRIVE READING Drive can accept only status and

UNLOAD commands.

8 DRIVE BUSY Drive can accept only status and

UNLOAD commands.

9 DRIVE UNLOADING Tape is being unthreaded and

ejected.

10 DRIVE MEDIA REMOVABLE Cartridge has been ejected and is

ready for extraction by the library.

LTO-2 SCSI Interface Guide 57

Value State Description

Chapter 2 SCSI Commands

INQUIRY Command

MAM

Accessible?

11 DRIVE LOAD FAILED

EJECTED

Loading failed and the cartridge was returned to the loadable/removable position.

12 DRIVE LOAD FAILED Loading failed. N

13 DRIVE LOAD FAILED HOLD Loading failed and the cartridge is

in the drive at the Hold position.

14 DRIVE EJECT FAILED Ejection failed. N

15 DRIVE EJECT FAILED HOLD Ejection failed and the cartridge is

in the drive at the Hold position.

16 DRIVE STATE UNKNOWN. N

17 DRIVE CLEANING FAILED Cleaning cartridge expired or

cleaning failed for another reason. Tape may be threaded.

Cartridge Type Field Values

Table 42 Cartridge Type Field Values

Value Meaning

0 Empty – no cartridge is present

1 Cleaning cartridge

2 Unknown data cartridge

3 Firmware cartridge

4 Ultrium 1 Type A data cartridge

5 Ultrium 1 Type B data cartridge

6Ultrium 1 Type C data cartridge

LTO-2 SCSI Interface Guide 58

Command Support Data 2

Chapter 2 SCSI Commands

INQUIRY Command

7Ultrium 1 Type D data cartridge

8 Ultrium 2 Type A data cartridge

Table 43 Command Supp or t Data — Data Format

Table 44 Command Supp or t Data — Field Descriptions

Bits

Byte

7 6 5 4 3 2 1 0

Peripheral Qualifier Peripheral Device Type

Reserved SUPPORT

VERSION

Reserved

CDB SIZE (n-5)

CDB USAGE DATA

Field Bytes Bits Description

Peripheral

0 5-7 Always 000b.

Qualifier

Peripheral Device

0 0-4 Normally 01h to indicate a sequential

access device.

Type

Reserved 1 3-7 Always 0

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Chapter 2 SCSI Commands

INQUIRY Command

Field Bytes Bits Description

SUPPORT 1 0-2 3 = indicates SCSI operation code in

conformance to SCSI standard.

5 = indicates SCSI operation code in

conformance to vendor unique SCSI

standard.

VERSION 2 Always 3

Reserved 3-4 Always 0

CDB SIZE 5 Number of bytes in Command

Descriptor Block (CDB).

CDB USAGE DATA

6-n Information about the CDB for the

operation code being queried.

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INQUIRY Command

Completion Status 2 Table 45 shows the completion codes and messages for the INQUIRY

command.

Table 45 INQUIRY Command Completion Status

Code Message Description

00h Good Status • The tape is not moved; the current

position is maintained.

• The drive remains in any previously set modes.

• The drive is ready to perform any appropriate command.

02h Check

Condition

Use the

REQUEST SENSE command to

retrieve status information. Possible Sense Keys are:

Code Message Description

04h Hardware

Error

Parity error on the SCSI bus or drive hardware failure.

05h Illegal

Request

The Command Descriptor Block is invalid.

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Chapter 2 SCSI Commands

LOAD UNLOAD Command

LOAD UNLOAD Command 2

The LOAD UNLOAD command may be used to load or unload a cartridge. This command may also be used to request that the retension function be performed.

Table 46 LOAD UNLOAD Command Descriptor Block — Data Format

Table 47 LOAD UNLOAD Command Descriptor Block — Field Descriptions

Bits

Byte

7 6 5 4 3 2 1 0

0 Operation Code (1Bh)

Ignored LUN Reserved

2 Reserved

3 Reserved

4 Reserved Hold EOT

5 Control

Field Bytes Bits Description

Operation Code

Ignored Logical Unit

0 The Operation Code for the

UNLOAD

command is 1Bh.

1 5-7 The LUN field is vestigial from the

SCSI-1 standard and is ignored.

Reten

LOAD

Imm ed

Load

Immed 1 0 0 = Status is not returned until the

operation has completed.

1 = Status is returned as soon as buffered data and filemarks are written to the medium and the CDB has been validated.

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Chapter 2 SCSI Commands

LOAD UNLOAD Command

Field Bytes Bits Description

Hold 4 3 1 = Requests that the medium be

positioned to the Medium Auxiliary Memory Accessible position where the medium is seated into the drive but the tape is not threaded to BOT.

EOT 4 2 Not supported. Must be set to 0.

Reten 4 1 1 = Requests that the retension

function be performed on medium.

Load 4 0 0 = requests that the medium be

unloaded.

1 = requests that the medium be loaded.

Reserved All reserved bits must be 0.

Control 5 See Control Byte Format on page 29

Medium Position 2 The drive has three possible states where the medium may be positioned.

The locations, defined in the following sections, are:

• Medium Loadable Position

• Medium Auxiliary Memory Accessible Position

• Medium Loaded and Ready Position

If the Prevent Medium Removal state has been set using the PREVENT

ALLOW MEDIUM REMOVAL

command and a LOAD UNLOAD command is

issued that requests the medium be unloaded to the Medium Loadable position, then a check condition status will be returned. The sense key will be set to Illegal Request(05) and the additional sense data will be set to Medium Removal Prevented (5302).

If the Immediate (Immed) flag is 1, then the drive validates the command and waits for any previous command from any host to complete, including any immediate commands currently being processed, and for any buffered data to be flushed to tape. It will then report a deferred error for any preceding command or buffered data if appropriate. If there is no

LTO-2 SCSI Interface Guide 63

Chapter 2 SCSI Commands

LOAD UNLOAD Command

deferred error, the drive reports good status and initiates the command. If the Immediate flag is 0, status is not returned until after the command has completed.

Medium Loadable Position

Table 48 Medium Loadable Position

This position is where the medium is inserted into the drive but has not been seated into the drive and the tape has not been threaded to BOT.

Hold Reten Load Description

0 0 0 No action taken, Good Status is returned.

0 0 1 Load the medium to the Loaded position.

The medium will be ready at BOT.

0 1 0 Check condition, sense data 02/3A/03.

0 1 1 Load the medium to the Loaded position and

perform the retension operation. The medium will be ready at BOT.

1 0 0 Load the medium to the Medium Auxiliary

Memory Accessible position.

1 0 1 Load the medium to the Medium Auxiliary

Memory Accessible position.

1 1 0 Check condition, sense data 02/3A/03.

1 1 1 Check condition, sense data 02/3A/03.

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Chapter 2 SCSI Commands

LOAD UNLOAD Command

Medium Auxiliary Memory Accessible Position

Table 49 Medium Auxiliary Memory Accessible Position

This position is where the medium has been seated into the drive but the tape has not been threaded to BOT.

Hold Reten Load Description

0 0 0 Unload the medium to the Loadable

position.

0 0 1 Load the medium to the Loaded position.

The medium will be ready at BOT.

0 1 0 Check condition, sense data 02/3A/04.

0 1 1 Load the medium to the Loaded position and

perform the retension operation. The medium will be ready at BOT.

1 0 0 No action taken, Good Status is returned.

1 0 1 No action taken, Good Status is returned.

1 1 0 Check condition, sense data 02/3A/04.

1 1 1 Check condition, sense data 02/3A/04.

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Chapter 2 SCSI Commands

LOAD UNLOAD Command

Medium Loaded and Ready Position

Table 50 Medium Loaded and Ready Position

This position is where the medium has been seated into the drive and the tape has been threaded to BOT. The medium is ready to use.

Hold Reten Load Description

0 0 0 Unload the medium to the Loadable position.

0 0 1 Rewind the medium to the Loaded position.

The medium will be ready at BOT.

0 1 0 Perform the retension operation and unload

the medium to the Loadable position.

0 1 1 Perform the retension operation. The

medium will remain at the Loaded position ready at BOT.

1 0 0 Unload the medium to the Medium Auxiliary

Memory Accessible position.

1 0 1 Unload the medium to the Medium Auxiliary

Memory Accessible position.

1 1 0 Perform the retension operation and unload

the medium to the Medium Auxiliary Memory Accessible position.

1 1 1 Perform the retension operation and unload

the medium to the Medium Auxiliary Memory Accessible position.

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Chapter 2 SCSI Commands

LOAD UNLOAD Command

Completion Status 2 Table 51 shows the completion codes and messages for the LOAD

UNLOAD

command.

Table 51 LOAD UNLOAD Command Completion Status

Code Message Description

00h Good Status • The tape is positioned as requested.

• The drive remains in any previously set modes.

• The drive is ready to perform any appropriate command.

Note: If Immed is 1, then Good Status

only indicates that the command is valid.

02h Check

Condition

Use the

REQUEST SENSE command to

retrieve status information. Possible Sense Keys are:

Code Message Description

02h Not Ready No cartridge is in

the drive; cartridge is in the Loadable position; or the cartridge is in the Medium Auxiliary Memory Accessible Position.

04h Hardware

Error

Parity error on the SCSI bus or drive hardware failure.

LTO-2 SCSI Interface Guide 67

Code Message Description

Chapter 2 SCSI Commands

LOAD UNLOAD Command

05h Illegal

Request

06h Unit

Attention

Medium Removal Prevention has been set, or the command Descriptor Block is invalid.

The cartridge was loaded or unloaded to the Medium Loadable, Medium Auxiliary Memory Accessible, or Medium Loaded at BOT positions.

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Chapter 2 SCSI Commands

LOCATE Command

LOCATE Command 2

The LOCATE command moves to a specified position on the tape.

Before the locate operation is performed, all buffered data and filemarks are transferred to tape. On completion, the logical position is before the specified location.

Table 52 LOCATE Command Descriptor Block — Data Format

Byte

Bits

7 6 5 4 3 2 1 0

Operation Code (2Bh)

3–6

Ignored LUN Reserved Imm

Reserved

(MSB)

Block Address

(LSB)

Reserved

Control

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Chapter 2 SCSI Commands

LOCATE Command

Table 53 LOCATE Command Descriptor Block — Field Descriptions

Field Bytes Bits Description

Operation

0 The operation code for

LOCATE is 2Bh

Code

Ignored Logical

1 5-7 The LUN field is vestigial from the

SCSI-1 standard and is ignored.

Unit

Immed 1 0 0 = Status is not returned until the tape

is positioned.

1 = Status is returned as soon as the operation is initiated.

Block Address

3-6 The

logical position on tape to be set to the

LOCATE command causes the

value indicated by the Block Address field. Block 0 is the first block on tape. The value indicates the total number of records and marks between BOT and the desired logical position. A value of 0 will cause the tape to be positioned at BOT.

Reserved All reserved bits must be 0.

Control 9 See Control Byte Format on page 29

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LOCATE Command

Completion Status 2 Table 54 shows the completion codes and messages for the LOCATE

command.

Table 54 LOCATE Command Completion Status

Code Message Description

00h Good Status • The filemarks have been sent to the

buffer.

• The drive remains in any previously set mode.

Note: If Immed is 1, then Good Status

only indicates that the command is valid.

02h Check

Condition

Use the

REQUEST SENSE command to

retrieve status information. Possible Sense Keys are:

Code Message Description

02h Not Ready No cartridge is in

the drive.

03h Media Error Unrecoverable

data error encountered.

04h Hardware

Error

Parity error on the SCSI bus or drive hardware failure.

05h Illegal

Request

The Command Descriptor Block is invalid.

LTO-2 SCSI Interface Guide 71

Code Message Description

Chapter 2 SCSI Commands

LOCATE Command

06h Unit

Attention

The cartridge was changed, or the drive was reset prior to this command.

08 Blank Check The drive

encountered EOD.

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Chapter 2 SCSI Commands

LOG SELECT Command

LOG SELECT Command 2

The LOG SELECT and LOG SENSE commands work in conjunction to allow the host to control and obtain statistical information about cartridge usage and error rates. This information consists of counters of particular events.

The

LOG SELECT command is used to reset the log counters to their

default values. A SCSI Bus Reset, Bus Device Reset, or cartridge loading is also used to reset these counters (of pages 02h, 03h, 0Ch, and 32h.) Multiple pages are reset by a single affects pages 02h, 03h, 2Eh, and 32h only. (See chapter 2, LOG SENSE

Command for information about log pages and their format.)

LOG SELECT command. LOG SELECT

Table 55 LOG SELECT Command Descriptor Block — Data Format

Byte

7–8

Bits

7 6 5 4 3 2 1 0

Operation Code (4Ch)

Ignored LUN Reserved PCR Rsvd

PC Reserved

Reserved

(MSB)

Parameter List

(LSB)

Control

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Chapter 2 SCSI Commands

LOG SELECT Command

Table 56 LOG SELECT Command Descriptor Block — Field Descriptions

Field Bytes Bits Description

Operation Code

Ignored Logical

0 The Operation Code for

4Ch

1 5-7 The LUN field is vestigial from the SCSI-

1 standard and is ignored.

Unit

Parameter Code Reset (PCR)

1 1 0 = Reset values as specified by PC. Do

not clear the DU (Disable Update, see

Log Parameters

parameters of log pages 02h, 03h, 2Eh, and 32h. With page 2Eh log parameters are set to 0 only when PC = 11b.

1 = Reset log parameters on pages 02h, 03h, 2Eh, and 32h. All accumulated values are set to 0; all threshold values are set to maximums except page 2Eh. DU bits of the parameters of these log pages are also cleared.

Page Control (PC)

2 6-7 00b = Check Condition if Parameter List

Length > 0.

01b = Check Condition if Parameter List Length > 0.

LOG SELECT is

on page 76) bits of the

10b = All thresholds are set to maximums. Check Condition if Parameter List Length > 0.

11b = All accumulated values are set to 0. Check Condition if Parameter List Length > 0.

This field is ignored if PCR is not 0.

Parameter List Length

7-8 Always 0. Specifies the length (in bytes)

of the parameter list to be transferred during the Data Out phase. A 0 length indicates that no parameter data is to be transferred.

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Chapter 2 SCSI Commands

LOG SELECT Command

Field Bytes Bits Description

Reserved All reserved bits must be 0.

Control 9 See Control Byte Format on page 29

Note: Pages 00h, 0Ch, 14h, 16h, 30h, 31h, and 33h, 3Ah, and 3Ch

cannot be reset by

LOG SELECT.

The drive does not maintain a separate set of log parameters for each initiator. Therefore, a

LOG SELECT command affects all initiators.

Note: The subsequent section discusses the LOG SENSE command.

The log page codes and the log parameter codes are described in that section.

Log Pages 2 A log page is made up of a 4-byte page header and one or more log

parameters.

The following table shows the log page header format.

Table 57 Log Page Header — Data Format

Byte

Bits

7 6 5 4 3 2 1 0

Reserved Page Code

Reserved

(MSB)

2–3

Page Length, MSB

(LSB)

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Chapter 2 SCSI Commands

LOG SELECT Command

Table 58 Log Page Header — Field Descriptions

Field Bytes Bits Description

Page

0 0-5 Identifies the page.

Code

Page Length

2-3 Indicates the length of log parameters

(in bytes) that follow the page header.

Reserved All reserved bits must be 0.

Log Parameters 2 A log parameter is made up of a 4-byte parameter header and one or

more associated parameter data bytes.

The following table shows a typical log parameter format.

Table 59 Log Parameter — Data Format

Byte

Bits

7 6 5 4 3 2 1 0

(MSB)

0–1

Parameter Code

(LSB)

LTO-2 SCSI Interface Guide 76

DU DS Reserved

Parameter Length (n-3)

Parameter Value

Quantum LTO-2 SCSI User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

1SCSI Interface

Overview 1

ANSI Standards 1 SCSI is a set of standard interfaces established to support peripheral

Parallel SCSI Interface

Cabling and Connectors 1 The cabling requirements and pin assignments for the SCSI connector for

General Features 1 The LTO tape drive supports the following:

General Features 1 The LTO tape drive supports the following:

Disconnect/Reconnect Function

SCSI Messages 1 The SCSI message codes, descriptions, and directions are given in the

Inbound Messages 1 Table 2 lists drive-to-host SCSI messages and their definitions.

Outbound Messages 1 Table 3 lists host-to-drive SCSI messages and their definitions.

Extended Messages 1 The following table lists extended SCSI messages and their definitions.

Parity Errors 1 Table 5 describes the operation for each of the possible cases of parity

Message Exception Handling

Standards Conformance

LTO Conformance

General Behaviors 1

Reset Condition 1 When a reset is issued to the tape drive, the drive clears all uncompleted

Unit Attention Condition 1 The Unit Attention condition in the tape drive typically results from the

Contingent Allegiance Condition

Buffered Mode 1 Buffered Mode allows the most efficient operation of a tape drive. The

Immediate Commands 1 For Initiators that do not support the disconnect feature, the Immediate

Residual Length Function 1 When performing a WRITE command, the drive returns a Good Status

Early Warning Function 1 Early Warning on the LTO drive is a logical warning given when 64

Error Reporting 1 Soft errors are generally tape-quality related and occur more frequently

Variable and Fixed Mode Recording

Library Features 1 This section describes featues available in libraries that support LTO tape

2SCSI Commands

Command Set 2

Command Descriptor Blocks 2

Command Descriptor Block Formats

Operation Code Format 2 The Operation Code is composed of the Group Code and Command

Control Byte Format 2 The Control Byte is the last byte in any CDB.

Command Status

ERASE Command

Completion Status 2 Table 22 shows the completion codes and messages for the ERASE

INQUIRY Command

Standard Inquiry Data Page

Supported Vital Product Data (VPD) Page (00h)

Unit Serial Number Page (80h)

Device Identification Page (83h)

Drive Component Revision Levels Pages (C0h, C1h)

Drive Component Serial Number Page (C2, C3, C4, C5, C6h)

Drive Status Page (DFh) 2 The Drive Status Page provides a snapshot of the current state of the

Drive State Field Values 2 The Medium Auxiliary Memory (MAM) can be accessed only in the states

Cartridge Type Field Values

Command Support Data 2

Completion Status 2 Table 45 shows the completion codes and messages for the INQUIRY

LOAD UNLOAD Command

Medium Position 2 The drive has three possible states where the medium may be positioned.

Medium Loadable Position

Medium Auxiliary Memory Accessible Position

Medium Loaded and Ready Position

Completion Status 2 Table 51 shows the completion codes and messages for the LOAD

LOCATE Command

Completion Status 2 Table 54 shows the completion codes and messages for the LOCATE

LOG SELECT Command

Log Pages 2 A log page is made up of a 4-byte page header and one or more log

Log Parameters 2 A log parameter is made up of a 4-byte parameter header and one or