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SCSI Commands
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Quantum DLT 8000 Tape System
PERSISTENT RESERVATION OUT Command (5Fh) (continued)
Table 5–67 PERSISTENT RESERVATION OUT Command’s Service Action
Descriptions (continued)
Code
Name
Description
04h
Pre-
empt
A PERSISTENT RESERVATION OUT command with a successful Pre-empt service
action removes all persistent reservations for all initiators that have been registered
with the Service action Reservation key specified in the PERSISTENT RESERVATION
OUT command’s parameter list. A persistent reservation is also established for the
pre-empting initiator. Any commands from any initiator that have been accepted by
the device server as non-conflicting continue their normal executions. If a PERSISTENT
RESERVATION OUT command is sent that specifies a Pre-empt service action and no
persistent reservation exists for the initiator identified by the Service action
Reservation key, it is not an error condition.
A UNIT ATTENTION condition is established for the pre-empted initiators. The sense
key is set to UNIT ATTENTION; the additional sense data is set to RESERVATIONS
PREEMPTED. Commands that follow are subject to the persistent reservation
restrictions set by the pre-empting initiator.
The persistent reservation thus created by the pre-empting initiator is defined by the
Scope and Type fields of the PERSISTENT RESERVATION OUT command and the
corresponding fields of the command’s parameter list.
The registration keys for the pre-empted initiators are removed by the Pre-empt
service action; the reservation key for an initiator that has performed a Pre-empt
service action with its own Reservation key specified in the Service action Reservation
key remains unchanged, although all other specified releasing actions and
reservation actions are performed.
Note that persistent reservations are not superseded by a new persistent reservation
from any initiator except by the execution of a PERSISTENT RESERVATION OUT that
specifies either the Pre-empt or the Pre-empt and Clear service actions. New
persistent reservations that do not conflict with an existing persistent reservation
execute normally. The persistent reservation of a logical unit or extents having the
same Type value are permitted if no conflicting persistent reservations other than
the reservations being pre-empted are held by another initiator.
(continued)
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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