Persistent Reserve Out Command
August 2016 Commands 139
Clearing reservations should only be done in an error recovery situation.
Pre-empting Reservations Made by Another Initiator
A registered initiator can clear active reservations and registration keys by issuing a
Persistent Reserve Out command. The Service Action field is set to Pre-empt, the
Scope and Type fields are ignored. The Parameter List Length is set to 18h. In the
parameter data, the Reservation Key is set to the currently registered key for this
initiator. The Service Action Reservation Key field contains the registered key to be
cleared. If the Service Action Reservation Key was used to make the currently active
persistent reservation, the reservation is released.
If the Service Action field is set to Pre-empt and Abort instead of Pre-empt, all
commands belonging to initiators who registered with the cleared key will be
aborted.
When a reservation of type Exclusive Access, Registrants Only is Pre-empted, a unit
attention condition is established for the Pre-empted initiators.
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