Sony SDX-800V/R manual Persistent Reserve in 5Eh, Service Action, MSB Generation LSB

PERSISTENT RESERVE IN 6.Command Specification

6.9.PERSISTENT RESERVE IN 5Eh

Bit	7		6	5	4		3	2	1	0
Byte
0					Operation		Code (5Eh)
1		Logical Unit Number				Reserved		SERVICE ACTION
2						Reserved
3						Reserved
4						Reserved
5						Reserved
6						Reserved
7	(MSB)				Allocation Length
8										(LSB)
9	Unused (00b)					Reserved			Flag	Link

The PERSISTENT RESERV IN command is used to obtain about persistent reservations and reservation keys that are active within a drive.

The actual length of the PERSISTENT RESERVE IN parameter data is available in a parameter data field. SERVICE ACTION: The service action codes are defined:

Table 6-54: PERSISTENT RESERVATION IN Service action codes

Code	Name	Description
00h	READ KEYS	Reads all registered Reservation Keys
01h	READ RESERVATION	Reads the current persistent reservations
02h-1fh	Reserved	Reserved

READ KEYS – The READ KEYS service action that the drive return a parameter list containing a header and a list of each current registered initiator’s reservation key. If multiple initiators have registered with the same key, then that key value shall be listed multiple times, once for each such registration.

READ RESERVATIONS – The READ RESERVATIONS service action requests that the drive return a parameter list containing a header and the persistent reservation(s), if any, that is present in the drive. Multiple persistent reservations may be returned only if element reservations are present.

Allocation Length: The Allocation Length field indicates how much space has been reserved for the returned parameter list. If length is not sufficient to contain the entire parameter list, the first portion of the list shall be returned. This shall not be considered an error. If the remainder of the list is required, the application client should send a new PERSISTENT RESERV IN command with a Allocation Length field large enough to contain the entire list.

The returned the parameter data provided in response to a PERSISTENT RESERVE IN command with the READ KEYS service action has the following format:

Table 6-55: PERSISTENT RESERVATION IN parameter data for READ KEYS

Bit	7	6	5	4	3	2	1	0
Byte
0	(MSB)			GENERATION
3								(LSB)
4	(MSB)			Additional Length
7								(LSB)
				Reservation Key list
8	(MSB)			First reservation key
15								(LSB)
n-7	(MSB)			Last reservation key				(LSB)
n

SONY AIT-3Ex drive SDX-800V series Ver.1.1 6-59