User's Guide

Chapter 2 Media Changer Commands
Persistent Reserve Out Command (5Fh)
Quantum SuperLoader 3 Software Interface Guide 90
The following table illustrates which fields are set by the application
client and interpreted by the device server for each
Service and Scope
value.
Service Action
Reservation
Key
This field contains information needed for 3 service actions: the
Register
service action, the
Pre-empt service action, and the Pre-empt and Clear service
action. The
Service Action Reservation Key is ignored for all other service
actions.
For the
Register service action, the Service Action Reservation Key field
contains the new
Reservation Key to be registered.
For the
Pre-empt and the Pre-empt and Clear service actions, the Service Action
Reservation Key
contains the reservation key of the persistent reservations
that are being pre-empted. For the
Pre-empt and the Pre-empt and Clear
actions, any failure of the
Service Action Reservation Key to match any
registered keys results in the device server returning a
RESERVATION
CONFLICT
status.
Scope-Specific
Address
Ignored.
APTPL
Activate Persist Through Power Loss. This bit is valid only for Register and
Register and Ignore Existing Key service actions; it is ignored for all other
types of service actions.
If the last valid
APTPL bit value received by the device server is 0, the loss of
power in the target releases any persistent reservations and removes all
reservation keys. If the last valid
APTPL bit value is 1, the logical unit retains
all persistent reservations and all reservation keys for all initiators even if
power is lost and later returned. The most recently received valid
APTPL
value from any initiator governs the logical unit’s behavior in the event of a
power loss.
Field Name Description