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PERSISTENT RESERVE OUT Command (5Fh) SDLT 600 SCSI Interface Guide

4-146 January 2005 81-81200-02 REV A01

04h Pre-empt A PERSISTENT RESERVE 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 RESERVE OUT command’s parameter list. A

persistent reservation is also established for the pre-empting initiator.

Any commands from any initiator that the drive has accepted as non-

conflicting continue their normal executions. If an initiator sends a

PERSISTENT RESERVE OUT command 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 Code is set to RESERVATIONS PREEMPTED. Commands that

follow are subject to the persistent reservation restrictions set by the pre-

empting initiator.

The persistent reservation the pre-empting initiator created is defined by

the Scope and Type fields of the PERSISTENT RESERVE OUT

command and the corresponding fields of the command’s parameter list.

The Pre-empt service action removes the registration keys for the pre-

empted initiators; 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Note that persistent reservations are not superseded by a new persistent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

RESERVE OUT command that specifies either the Pre-empt or the Pre-

empt & Clear service actions. New persistent reservations that do not

conflict with an existing persistent reservation execute normally.

Table 4-83. PERSISTENT RESERVE OUT Command’s Service Action Descriptions (Continued)

Code Name Description

1 2 ... 183 184 185 186 187 188 189 190 191 192 193 ... 293 294

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Quantum 1200 Series DAT Autochanger Uživatelská příručka Strana 188