SCSI Command Overview
Drive Control Commands
Chapter 1
1-13
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The Head of Queue Tag message specifies that the I/O process be placed
first in the logical unit's command queue. When the drive receives a
subsequent I/O process received with a Head of Queue Tag message, the
I/O process that has been already done is not interrupted.
The Ordered Queue Tag message specifies that the I/O process be placed
in the logical unit's command queue for execution in the order received.
All queued I/O processes for the logical unit received prior to this I/O
process are executed before this I/O process is executed. All queued I/O
processes received after this I/O process are executed after this I/O
process, except for I/O processes received with a Head of Queue Tag
message.
Identify 80H-FFH
These messages are sent by either the initiator or the target to establish
the physical path connection between initiator and target for a particular
logical unit.
Bit 7
This bit is always set to 1.
Bit 6
This bit is set to 1 by the initiator to indicate that the
initiator has the ability to accommodate the disconnec-
tion and reconnection.
Bit 5-3
Reserved.
Table 1-6
Head of Queue Tag
Byte
7
6
5
4
3
2
1
0
0
Message Code (21H)
1
Queue Tag (00H-FFH)
Table 1-7
Ordered Queue Tag
Byte
7
6
5
4
3
2
1
0
0
Message Code (22H)
1
Queue Tag (00H-FFH)
Содержание SureStore Optical 2600fx
Страница 1: ...optical drive and library SCSI 2 command reference for models fx ex and mx ...
Страница 11: ...Contents x ...
Страница 20: ...Chapter 1 1 1 SCSI Command Overview 1 SCSI Command Overview ...
Страница 38: ...Chapter 2 2 1 Drive Commands SCSI 2 Drive Commands 2 SCSI 2 Drive Command Set ...
Страница 187: ...SCSI 2 Drive Command Set Write Long Command DFH Chapter 2 2 150 ...
Страница 188: ...Chapter 3 3 1 Jukebox SCSI 2 Commands 3 Jukebox SCSI 2 Command Set ...
Страница 264: ...Appendix A A 1 Drive Error Codes A Drive Error Codes ...
Страница 287: ...Drive Error Codes DSP Error Codes Appendix A A 24 ...
Страница 288: ...Appendix B B 1 Autochanger Error Codes B Autochanger Error Codes ...
Страница 339: ...Autochanger Error Codes Jukebox Micro Move Error Codes Appendix B B 52 ...
Страница 340: ...Appendix C C 1 Field Replaceable Units C Field Replaceable Units FRUs ...
Страница 345: ...Field Replaceable Units FRUs HP Field Replaceable Units FRUs Appendix C C 6 ...
Страница 346: ...Appendix D D 1 Micro Macro Moves D Micro Macro Moves ...
Страница 369: ...Micro Macro Moves HP Surestore Optical Micro Move IDs Appendix D D 24 ...
Страница 370: ...Appendix E E 1 Disconnect Timeouts E Disconnect Timeout Settings ...
Страница 373: ...Disconnect Timeout Settings Disconnect Timeout Settings Appendix E E 4 ...
Страница 377: ...Index 4 ...
Страница 378: ...Copyright 2001 Hewlett Packard Company Printed in U S A Edition 12 2001 www hp com go support Printed on recycled paper ...