Maxtor 10K III manual 120

SCSI Description

&CVC￿(KGNF				moved by:	&GUETKRVKQP
			The value of the Type field specifies the characteristics of the persistent reservation
Type			being established for all data blocks within the extent or within the logical unit. Refer
			to Table 5-121 for the applicable Type codes and their meanings
			Fields contained in the PERSISTENT RESERVATION OUT parameter list specify the res-
			ervation keys and extent information required to perform a persistent reservation ser-
Parameter			vice action.
List Length			The parameter list is 24 bytes in length; the Parameter List Length field contains 24
			(18h) bytes.
		Table 5-120 provides detailed descriptions of each of the PERSISTENT
		RESERVATION OUT command’s seven possible service actions (Service Action
		codes appear in bits 0 – 4 of Byte 1).
				PERSISTENT RESERVATION OUT Command’s Service Action Descriptions
				When the command executes a Register service action, it registers a reserva-
				tion key with a device server without generating a reservation. The device serv-
				er holds these reservation keys from each initiator that performs a PERSISTENT
				RESERVATION OUT command with a Register service action until the key is
				changed by a new PERSISTENT RESERVATION OUT command with Register
				service action from the same initiator, or until the initiator registration is re-
					• Powering down the logical unit, if the last
					Activate Persist Through Power Loss
					(APTPL; see Figure 5-55 and Table 5-61)
					received by the device server was 0;
					• Performing a Clear service action;
%QFG00h	Register0COG				• Performing&GUETKRVKQPa Pre-empt service action;
Table5-120					• Performing a Pre-empt and Clear service
					action; or
					• Performing a Register service action from the
					same initiator with the value of the service
					action reservation key set to 0.

When a reservation key has not yet been established or when the reservation key has been removed, a reservation key of 0 is used when the initiator per- forms a PERSISTENT RESERVATION OUT with the Register service action.

When the reservation has been removed, no information is reported for the ini- tiator in the Read Keys service action of the resulting PERSISTENT RESERVA- TION IN command.

		A PERSISTENT RESERVATION OUT command with Reserve service action cre-
		ates a persistent reservation with a specified Scope and Type.
		Persistent reservations are not superseded by a new persistent reservation from
		any initiator except by the execution of a PERSISTENT RESERVATION OUT
		command that specifies either a Pre-empt or Pre-empt and Clear service action.
		New persistent reservations that do not conflict with an existing persistent res-
01h	Reserve	ervation execute normally. Persistent reservations of logical units or extents
		having the same Type value are permitted if no conflicting persistent reserva-
		tions are held by another initiator. When these types of overlapping reserva-
		tions are released, each of the extent reservations and logical unit reservations
		are removed with a separate Release service action. Multiple identical reserva-
		tions from the same initiator are all released simultaneously via a single Release
		service action that matches the reservations.

5-98 Maxtor Atlas 10K III