Release Unit Command 17h, Device ID | Quantum Instruments DLT 7000

SCSI Commands

5.17RELEASE UNIT COMMAND (17h)

The RELEASE UNIT command releases the drive if it is currently reserved by the requesting initiator. It is not an error to release the tape drive if it is not currently reserved by the requesting initiator. If the tape drive is reserved by another initiator, however, it is not released; the tape drive is only released from the initiator that issued the RELEASE command.

Bit

Byte

Operation Code (17h)

Logical Unit Number

3rd Pty

Third Party Device ID

Rsv’d

2 - 4

Reserved

Unused

Reserved

Flag

Link

Figure 5–71 RELEASE UNIT Command Descriptor Block - Data Format

Table 5–68

RELEASE UNIT Command Data - Field Descriptions

Field Name

Description

3rdPty

The third party release option for RELEASE UNIT allows an initiator to release a

logical unit that was previously reserved using the third-party reservation option.

If this bit is 0, then the third-party release option is not requested. If this bit is set

to 1, the drive is released if it was originally reserved by the same initiator using

the third-party reservation option and if the tape drive is the same SCSI device

specified in the Third Party Device ID field.

Third Party

Required if the 3rdPty bit is 1. This field specifies the SCSI ID of the initiator

Device ID

whose third party reservation is being released. This field must be set if the

initiator of the original third party RESERVE is the source of the RELEASE.

5-142

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Release Unit Command 17h, Device ID

Models: DLT 7000