PERSISTENT RESERVE OUT (5Fh)
The PERSISTENT RESERVE OUT command is used to request service actions that reserve the whole
library or certain elements for the exclusive or shared use of a particular initiator. The command uses other
service actions to manage and remove such reservations. The command shall be used in conjunction with
the PERSISTENT RESERVE IN command and shall not be used with the RESERVE and RELEASE
commands.
Initiators performing PERSISTENT RESERVE OUT service actions are identified by a reservation key
provided by the application client. An application client may use the PERSISTENT RESERVE IN command
to obtain the reservation key for the initiator holding a persistent reservation and may use the
PERSISTENT RESERVE OUT command to preempt that reservation.
Bit 7 6 5 4 3 2 1 0
Byte
0 Operation Code (5Fh)
1 LUN Service Action
2 Scope Type
3 Reserved
4 Reserved
5 Reserved
6 Reserved
7 (MSB) Parameter List Length
8 (LSB)
9 Control
Field descriptions:
Service Action:
The following service actions are supported:
Code Name Description
00h Register Register a reservation key with the device server
01h Reserve Creates a persistent reservation having a specified Scope and Type.
02h Release Releases the selected reservation for the requesting initiator
03h Clear Clears all reservation keys and all persistent reservations.
04h Preempt Preempts persistent reservations from another initiator
05h Preempt and Abort Preempts persistent reservations from another initiator and aborts all
tasks for all initiators registered with the specified registration key.
06h Register and ignore existing
Key
Register a reservation key with the device server.
07h - 1Fh Reserved Reserved
Type:
Scope:
The value in the Scope field specifies whether a persistent reservation applies to an entire logical
unit or to an element.
Code Description
Chapter 3. Supported SCSI Commands 3-45
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