HP C737990900 - Manual (Page 143)

Commands 143
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Third-Party Device ID This is required and used only when the 3rd Pty bit is set, in which case this field
specifies the SCSI ID of the initiator to be granted the reservation of the logical unit.
The drive preserves the reservation until one of the following occurs:
■
It is superseded by another valid RESERVE UNIT command from the same initiator.
■
It is released by the same initiator with a third-party RELEASE UNIT command with
the same value in the Third-Party Device ID field.
■ It is released by a hard reset or a power-cycle.
The drive ignores any attempt to release the reservation made by any other initiator,
including the initiator for which the reservation was made.
It is valid for an initiator to reserve the drive using a third-party reservation over itself.
In this case, a non-third-party RELEASE UNIT command could also release the
reservation.