Hitachi ULTRASTAR 15K450 HUS154530VLF400 - Manual (Page 222)

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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19.13.4.1 Scope, Type
The Scope and the Type are applied in the process for the Reserve, Release, and Preempted and Clear service action but they
are ignored in the process for the Register service action because they are not used.
19.13.4.2 Reservation Key
The Reservation Key is verified in each service action process. If the Initiator that registered a key is different from the Initia-
tor requesting PERSISTENT RESERVE OUT command, the drive returns a Reservation Conflict status.
19.13.4.3 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 RESERVE OUT command.
On Preempt and Clear service action, the reservation that has a key specified in the Service Action Reservation Key field is
preempted.
On other service actions, this field is ignored.
19.13.4.4 Scope-specified address
Parameter in the Scope-specified address field is ignored by the drive.
19.13.4.5 Extent length
Parameter in the Extent length field is ignored by the drive.
19.13.4.6 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.
Table 173: APTPL and information held by a drive
19.13.4.7 Generation counter
The drive increments the Generation counter when Register service action or Preempt and Clear service action complete suc-
cessfully.
Information
held by the drive
The last valid APTPL value
0 1
Registration all keys are set to 0 retained
Persistent Reservation all are removed retained
Generation counter set to 0 set to 0