Maxtor 10K V manual 115Persistent Reservation Type Codes and Their Meanings

Table 5-115 presents the definitions of the characters of the available “Type” values from the Type field of the PERSISTENT RESERVATION IN Read Reservations parameters.

Each of the codes provides handling instructions for READ operations, for WRITE operations, and for subsequent attempts to establish persistent reservations (referred to as “Additional Reservations Allowed” in the table).

Table 5-115Persistent Reservation Type Codes and Their Meanings

Code	Name	Description
		READS: Shared; any application client on any initiator may execute commands that
		perform transfers from the disk to the initiator.
0h	READ Shared	WRITES: Prohibited; any command from any initiator that performs a transfer from the
		initiator to the disk results in a reservation conflict.
		ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logical unit,
		extents, or elements as long as the persistent reservations do not conflict with any res-
		ervations already known to the device server.
		READS: Shared; any application client on any initiator may execute commands that
		perform transfers from the disk to the initiator.
	WRITE Exclu-	WRITES: Exclusive; any command from any initiator other than the initiator that holds
1h		the persistent reservation that attempts a transfer to the disk results in a reservation con-
	sive	flict
		ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logical unit,
		extents, or elements as long as the persistent reservations do not conflict with any res-
		ervations already known to the device server.
		READS: Exclusive; any command from any initiator other than the initiator that holds
		the persistent reservation that attempts a transfer from the disk results in a reservation
		conflict
2h	READ Exclusive	WRITES: Shared; any application client on any initiator may execute commands that
		perform transfers to the disk from the initiator.
		ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logical unit,
		extents, or elements as long as the persistent reservations do not conflict with any res-
		ervations already known to the device server.
		READS: Exclusive; any command from any initiator other than the initiator holding the
		persistent reservation that attempts a transfer from the disk results in a reservation con-
		flict.
		WRITES: Exclusive; any command from any initiator other than the initiator holding
		the persistent reservation that attempts a transfer to the disk results in a reservation con-
3h	Exclusive Access	flict.
		ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVATION
		OUT command with the Reserve service action from any initiator other than the initiator
		holding the persistent reservation results in a reservation conflict. The initiator that
		holds the persistent reservation can reserve the logical unit, extents, or elements as long
		as the persistent reservations do not conflict with any reservations already known to the
		device server.

Maxtor Atlas 10K V 5-87