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RELEASE UNIT Command (17h) SDLT 600 SCSI Interface Guide

4-198 January 2005 81-81200-02 REV A01

4.21 RELEASE UNIT Command (17h)

NOTE: This command has been made obsolete in the latest version of SCSI-3 and

should not be used with any new implementations. The SDLT tape drive

supports this command for legacy applications only.

The RELEASE UNIT command releases the SDLT tape drive if it is currently reserved by the

requesting initiator. It is not an error to release the drive if it is not currently reserved by the requesting

initiator. If the drive is reserved by another initiator, however, it is not released; the drive is only

released from the initiator that issued the RELEASE UNIT command.

Figure 4-106. RELEASE UNIT Command Descriptor Block — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (17h)

1 Logical Unit Number 3rdPty Third Party Device ID Rsv’d

2 - 4 Reserved

5 Control

Table 4-115. RELEASE UNIT Command — 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. When set to 0, the third-party release option is not

requested. When set to 1, the drive is released if the same initiator originally

reserved it using the third-party reservation option and if the drive is the same

SCSI device specified in the Third Party Device ID field.

Third Party

Device ID

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

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

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

SDLT 600

SCSI Interface Guide

SCSI Commands

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