Fujitsu MAP3735, MAP3367, MAP3147, MAS3735, MAS3367 specifications Persistent Reserve OUT 5E, Msb

Command Specifications

3.1.19PERSISTENT RESERVE OUT (5E)

Bit	7	6		5		4		3		2	1	0
Byte
0							X'5E'
1	0	0	0						Service Action
2			Scope							Type
3	0	0	0		0		0		0		0	0
4	0	0	0		0		0		0		0	0
5	0	0	0		0		0		0		0	0
6	0	0	0		0		0		0		0	0
7	(MSB)
					Parameter List Length (18h)
8												(LSB)
9							Control

The PERSISTENT RESERVE OUT command reserves a logical unit for exclusive or shared use by a particular initiator. This command is used in combination with the PERSISTENT RESERVE IN command. However, this command is not associated with the RESERVE or RELEASE command.

The persistent reservation conflicts with the reservation requirements specified by the RESERVE command (RESERVATION CONFLICT). The initiator defines the reservation key. The reservation key identifies the initiator that executes a service action of the PERSISTENT RESERVE OUT command. The initiator can verify which initiators have caused conflicts with the reservation requirements and which initiators hold invalid reservation requirements. If necessary, the initiator can also preempt reservation rights by issuing the PERSISTENT RESERVE OUT command.

The set reservation requirements are not reset by processing such as the TARGET RESET task. Therefore, a persistent reservation can be used for sharing a device among multiple initiators. The PERSISTENT RESERVATION OUT and PERSISTENT RESERVATION IN commands provides basic features for analyzing the dynamically changeable reservation status on a multi-initiator system using multi-port targets. These commands can identify whether a particular reservation requirement is held. They can also eliminate the requirements from an initiator that has an error or is not cooperative.

When a drive receives this command and a reservation requirement has been held by the RESERVE/RESERVE EXTEND command, the command is rejected and returned with the RESERVATION CONFLICT status.

When this command is issued, if an invalid drive resource exists, the drive returns the "CHECK CONDITION" status. The sense key is set to ILLEGAL REQUEST [=5]. Sense data is set to INSUFFICIENT REGISTRATION RESOURCES [=55-04].

(However, SCSI devices do not report sense information.)

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