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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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Summary of Contents for ATL SuperLoader ATL
Page 1: ...ATL SuperLoader DLT and ATL SuperLoader LTO Software Interface Guide 81 60220 01 A02...
Page 18: ...Preface Document Conventions xviii Quantum ATL SuperLoader Software Interface Guide...
Page 44: ...Chapter 2 Messages Supported SCSI Messages 26 Quantum ATL SuperLoader Software Interface Guide...
Page 196: ...Index 178 Quantum ATL SuperLoader Software Interface Guide...