4.1 Control/Sense Commands

A logical unit uses the SA space to maintain PERSISTENT RESERVATION and registered keys (across a power shutdown). If the drive is not in the Ready state when the Activate Persist Through Power Loss mechanism (this mechanism maintains reserve conditions during a power shutdown) is enabled by the PERSISTENT RESERVE OUT command, the drive reports the CHECK CONDITION status. The sense key is set to NOT READY [= 2], and the sense data is set according to the same definition that is used to report to the TEST UNIT READY command.

(1) PERSISTENT RESERVE OUT service actions

When processing the PERSISTENT RESERVE OUT service actions, the device server shall update the generation value as specified in 4.1.17 (2).

The PERSISTENT RESERVE OUT command service actions are defined in table 4.30.

Table 4.30 PERSISTENT RESERVE OUT service action codes

Code

Name

Description

 

 

 

00h

REGISTER

Register a reservation key with the device server.

 

 

 

01h

RESERVE

Generates a persistent reservation having a specified

 

 

SCOPE and TYPE.

 

 

 

02h

RELEASE

Releases persistent reservations.

 

 

 

03h

CLEAR

Clears all reservation keys and all persistent reservations.

 

 

 

04h

PREEMPT

Preempts persistent reservations from another initiator.

 

 

 

05h

PREEMPT & ABORT

Preempts persistent reservations from another initiator

 

 

and aborts the task set for the preempted initiator.

 

 

 

06h

REGISTER

Register a reservation key with the drive.

 

AND IGNORE

 

 

EXISTING KEY

 

 

 

 

07h-1Fh

Reserved

 

 

 

 

The parameter list values for each service action are specified in 4.1.18 (2).

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Fujitsu MBA3300RC, MBC2036RC, MBC2073RC Persistent Reserve OUT service actions, Persistent Reserve OUT service action codes