SCSI Commands
5-202
Quantum DLT 8000 Tape System
RESERVE UNIT (6) Command (16h) (continued)
Table 5–90 RESERVE UNIT (6) Command Data — Field Descriptions
Field Name
Description
3rdPty
The third party reservation option for RESERVE UNIT (6) allows an
initiator to reserve a logical unit for another SCSI device. This option is
intended for systems that use COPY, and is implemented by the tape
drive.
If set to 1, logical unit is reserved for the SCSI device whose ID
appears in the Third Party Device ID field. The tape drive ignores any
attempt made by any other initiator to release the reservation and
returns a GOOD status.
If set to 0, no third party reservation is requested and device is
reserved for the initiator that issued the CDB.
Third Party Device ID
If 3rdPty is set to 1 (indicating that an initiator has reserved the logical
unit for another SCSI device), this field contains the ID number of that
SCSI device for which the reservation was made.
A reservation via the RESERVE UNIT (6) command remains in effect until one of the
following conditions is met:
•
The initiator that made the reservation sends another RESERVE UNIT (6)
command.
•
The tape drive is released via a RELEASE UNIT (6) command from the same
initiator.
•
A BUS DEVICE RESET message is received from any initiator.
•
A hard reset occurs.
The occurrence of the last two conditions is indicated by the drive returning a CHECK
CONDITION status, sense key of UNIT ATTENTION on the next command following
the condition. It is not an error to issue a RESERVE UNIT (6) command to a drive that
is currently reserved by the requesting initiator.
If the logical unit has previously been reserved by another initiator, the target returns a
RESERVATION CONFLICT status.
If, after honoring the reservation, any other initiator attempts to perform any command
except INQUIRY, REQUEST SENSE, or RELEASE UNIT (6), the command is rejected
with a RESERVATION CONFLICT status. A RELEASE UNIT (6) command issued by
another initiator is ignored by that logical unit.
Summary of Contents for DLTtape DLT 8000
Page 1: ...DLTTM 8000 Tape System Product Manual Nov 10 2003 81 60118 06...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued...
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Page 26: ...Table of Contents xxiv Quantum DLT 8000 Tape System...
Page 36: ...About This Manual Quantum DLT 8000 Tape System xxxii...
Page 54: ...General Description and Specifications 1 18 Quantum DLT 8000 Tape System...
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Page 376: ...Appendix A Definition of Vendor Unique Sense Data Information A 4 Quantum DLT 8000 Tape System...
Page 386: ...Appendix C Updating the Firmware C 6 Quantum DLT 8000 Tape System...
Page 396: ...Appendix E Visual Inspection Procedure for DLTtape Cartridges E 8 Quantum DLT 8000 Tape System...
Page 406: ...Appendix G DLT 7000 Emulation Feature G 8 Quantum DLT 8000 Tape System...
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