Hitachi HUS154530VLF400 User Manual

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification

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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.

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.

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.

Parameter in the Scope-specified address field is ignored by the drive.

Parameter in the Extent length field is ignored by the drive.

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.

The drive increments the Generation counter when Register service action or Preempt and Clear service action complete suc-
cessfully.