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Chapter 3 Media Changer Commands

Persistent Reserve Out Command (5Fh)

Quantum ATL SuperLoader Software Interface Guide 107

03h Clear A PERSISTENT RESERVE OUT command with a successful Clear service

action removes all persistent reservations for all initiators. All reservation

keys are also removed. Any commands from any initiator that have been

accepted by the device server as non-conflicting continue their normal

executions.

A UNIT ATTENTION condition is established for all registered initiators

for the logical unit. The sense key is set to UNIT ATTENTION; the

additional sense data is set to RESERVATIONS PREEMPTED.

Note that applications should not use the Clear action service except

during recoveries associated with initiator or system reconfiguration,

since data integrity may be compromised.

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 have been accepted by the device server

as non-conflicting continue their normal executions. If a PERSISTENT

RESERVE 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.

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