User's Guide

Quantum Scalar Intelligent Libraries SCSI Reference Guide Guide 49

Persistent Reserve In – 5Eh

What the Library Does With This Command

The library returns information about persistent reservation and reservation keys that are currently active.

This command is supported by:

• the Media Changer via the DA blade, or

• the tape drive hosting the Media Changer control path, in which case this command is handled

completely by the tape drive on behalf of the Media Changer.

Command Usage

This command is used in conjunction with PERSISTENT RESERVE OUT to manage persistent

reservations. It can be used to retrieve a list of the current reservations and the registered reservation keys.

The PERSISTENT RESERVE IN and PERSISTENT RESERVE OUT commands should not be used with

the RESERVE ELEMENT and RELEASE ELEMENT commands.

Persistent Reserve In CDB Format

The PERSISTENT RESERVE IN CDB format is shown in the following table.

Service Action – This field specifies the type of request being made as follows:

• 0h – Read all registered reservation keys.

• 1h – Read all current persistent reservations.

• 2h – Report capabilities of the supported persistent reservation features (only supported if the

command is issued to a Media Changer hosted by a tape drive).

• 3h – Report full status of registration and reservation status for each registered I_T nexus (only

supported if the command is issued to a Media Changer hosted by a tape drive).

Table 45 PERSISTENT RESERVE IN CDB format

Bit

Byte

76543210

0Op Code (5Eh)

1 Logical Unit Number Service Action

2 Reserved

3 Reserved

4 Reserved

5 Reserved

6 Reserved

Allocation Length

9 Control