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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Note that persistent reservations are not superseded by a new persistent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.
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