Fujitsu MAP3367, MAP3147, MAS3735, MAP3735, MAS3367 specifications Persistent reservation scope

3.1 Control/Sense Commands

The "Additional Length" field contains a count of the number of bytes to follow in the "Reservation Descriptors" field. If the specified allocation length in the CDB of the PERSISTENT RESERVE IN command is not sufficient for containing the entire parameter list, a portion of the parameter list from byte 0 to the specified allocation length is transferred to the initiator. If the remaining data of the list may be truncated, valid reservation descriptors are created in the "Additional Length" field.

1. The format of the PERSISTENT RESERVE IN reservation descriptors is shown below.

	Bit	7	6		5		4	3	2		1	0
Byte
0	(8)	(MSB)
							Reservation Key
7 (15)												(LSB)
8 (16)		(MSB)
						Scope-specific Address
11	(19)											(LSB)
12	(20)						X'00' (Reserved)
13	(21)			Scope						Type
14-15							X'00' (Reserved)
(22-23)

The reservation requirements kept by a logical unit are displayed with the Reservation Descriptors in the parameter data. The Descriptors include reservation keys of the initiator that holds the reservation requirements. The Descriptors also include the "Type" value and the "Scope" value of the reservation requirements specified by the PERSISTENT RESERVE OUT command (See Sections 3.1.18.3.1 and 3.1.18.3.2).

The reservation key indicates a key registered according to the reservation requirements. If each initiator uses a unique key, the application must associate the initiator that holds the reservation requirements with the reservation key.

If "Scope" is the Element reservation, the "Scope-specific Address" field indicates an element address, where zeros are filled in the upper bytes. If the "Scope" is a logical unit reservation, the "Scope-specific Address" field shall be set to zero.

Note: MA*3*** series product does not support the Element reservation.

3.1.18.3.1 Persistent reservation scope

The value in the "Scope" field indicates that either a persistent reservation applies to an entire logical unit, or it applies part of the logical unit (element). "Scope" field values are defined below.

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