Maxtor 10K III manual 110, Persistent Reservation in Command-Field Descriptions

	SCSI Description
	PERSISTENT RESERVATION IN Command-Field Descriptions
Table5-109
Service&CVC￿(KGNFAction	Service actions that require information&GUETKRVKQPabout persistent reservation and registra-
	tions may require enabling of nonvolatile memory within the logical unit.
	Service action codes available are:
	Code Name Description
	00h Read Keys Reads all registered Reservation keys
	01h Read Reservations Reads all current persistent reservations
	02 – 1Fh Reserved
	A “Read Keys” service action requests that the device server return a parameter list
	that includes a header and a complete list of all of the reservation keys currently reg-
	istered with the device server. If multiple initiators have registered with the same
	key, then the key is listed multiple times, once for each registration. Refer to Table
	5-110and Table 5-111for information about Read Keys parameter data.
	A “Read Reservation” service action requests that the device server return a param-
	eter list that contains a header and a complete list of all persistent reservations that
	are presently active in the device server and its extents. Note that duplicate persis-
	tent reservations from the same initiator are not reported. Refer to Table 5-114and
	Table 5-113for information about Read Reservations parameter data.
Allocation	This field indicates how much space has been reserved for the returned parameter
Length	list (Read Keys or Read Reservations parameters). The actual length of the parameter
	data is indicated in the parameter data field for those parameters.
	If the Allocation Length is not sufficient to contain the entire list of parameters, the
	first portion of the list that does fit is returned. If it is determined that the remainder
	of the list is required, the client should send a new PERSISTENT RESERVATION IN
	command with an Allocation Length field large enough to contain the entire list of
	parameters.

The data format and field descriptions for the Read Keys Parameters are described in Table 5-110and Table 5-111respectively.

Read Keys Parameters-Data Format

$[VG0 - 3		(MSB)					￿Generation￿
	$KV	￿		￿	￿				￿	￿	￿
											(LSB)
4 - 7		(MSB)				Additional Length (		– 7)
											(LSB)
				(Reservation Key List Follows in Bytes 8 – )
8 - 15		(MSB)				First Reservation Key
											(LSB)
– 7 to n		(MSB)
			Table5-110			Last Reservation Key
								2Maxtor2Atlas 10K III			(LSB)
2											5-89