Dell PowerVault TL4000 - Manual (Page 56)

PERSISTENT RESERVE IN (5Eh)
The PERSISTENT RESERVE IN command is used to obtain information about persistent reservation keys
that are active within a library. This command is used in conjunction with the PERSISTENT RESERVE
OUT command.
Bit 7 6 5 4 3 2 1 0
Byte
0 Operation Code (5Eh)
1 LUN Service Action
2 Reserved
3 Reserved
4 Reserved
5 Reserved
6 Reserved
7 (MSB) Allocation Length
8 (LSB)
9 Control
Field descriptions:
Service Action:
The following service actions are supported:
Code Name Description
00h Read Keys Reads all registered Reservation Keys
01h Read Reservation Reads the current persistent reservations
02h - 1Fh Reserved Reserved
Allocation Length:
By means of the Allocation Length field the application client specifies how much space has been
allocated for the returned parameter list.
PERSISTENT RESERVE IN Parameter Data for Read Keys
The format for the parameter data provided in response to a PERSISTENT RESERVE IN command with
the Read Keys service action is shown below:
Bit 7 6 5 4 3 2 1 0
Byte
0 (MSB) Generation
3 (LSB)
4 (MSB) Additional length (n - 7)
7 (LSB)
Reservation Key List
8 (MSB) First reservation key
15 (LSB)
...
3-42 TL2000 and TL4000 SCSI Reference