IBM Ultrastar 36LZX Specifications page 137

8.13.5.2 Reservation Key
The Reservation Key is verified in each service action process. If the initiator which registered a key is
different from the initiator requesting PERSISTENT RESERVATION OUT command, the drive returns a
RESERVATION CONFLICT status.
8.13.5.3 Service Action Reservation Key
On Register service action, the drive saves the key specified in the Service Action Reservation Key field
as a key of initiator requesting PERSISTENT RESERVATION OUT command.
On Preempt and Clear service action, the reservation which has a key specified in the Service Action
Reservation Key field is preempted.
On other service actions, this field is ignored.
8.13.5.4 Scope-specified address
Parameter in the Scope-specified address field is ignored by the drive.
8.13.5.5 Extent length
Parameter in the Extent length field is ignored by the drive.
8.13.5.6 APTPL
The APTPL (Active Persist Through Power Loss) is valid only for the Register service action. The drive
ignores the APTPL in other service actions.
The following table shows the relationship between the last valid APTPL value and information held by
the drive.
Information
held by the drive
Registration
Persistent Reservation
Generation counter
Figure 108. APTPL and information held by a drive
8.13.5.7 Generation counter
The drive increments the Generation counter when Register service action or Preempt and Clear service
action complete successfully.
The last valid APTPL value
0
all keys are set to 0
all are removed
set to 0
Ultrastar 36LZX hard disk drive specifications
retained
retained
set to 0
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