User's Guide

Chapter 2 Media Changer Commands
Persistent Reserve Out Command (5Fh)
Quantum SuperLoader 3 Software Interface Guide 84
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.
Code Name Description