SCSI Commands: 26BPERSISTENT RESERVE OUT
Page
117
3.14
PERSISTENT RESERVE OUT
The PERSISTENT RESERVE OUT command is used to request service actions that
reserve a logical unit or element 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.
3.14.1
Command Descriptor Block
Byte
Bits
7 6 5 4 3 2 1 0
0
Operation Code (5Fh)
1
Reserved Service
Action
2
Scope Type
3
Reserved
4
Reserved
5
Reserved
6
Reserved
7
(MSB)
8
Parameter Length
(LSB)
9
Control
3.14.1.1
Field Descriptions
Field
Bytes
Bits
Description
Operation
Code
0
The Operation Code for PERSISTENT RESERVE OUT is 5Fh.
Service
Action
1 0-4
See following table.
Scope 2
4-7 0h = LU_SCOPE: Persistent reservation applies to the full
logical unit
Type 2
0-3
See Type field for the PERSISTENT RESERVE IN reservation
descriptor.
Reserved
All reserved bits must be 0.
Control 9
See
SCSI Command Control Byte Format on page 25.
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