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RESERVE UNIT Command (16h) SDLT 600 SCSI Interface Guide

4-230 January 2005 81-81200-02 REV A01

4.29 RESERVE UNIT Command (16h)

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 RESERVE UNIT command reserves the specified SDLT tape drive for the exclusive use of the

requesting initiator or for another specified SCSI device.

Figure 4-124. REQUEST SENSE Command Descriptor Block — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (16h)

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

2 - 4 Reserved

5 Control

Table 4-133. RESERVE UNIT Command Data — Field Descriptions

Field Name Description

3rdPty The third-party reservation option for RESERVE UNIT allows an initiator to

reserve a logical unit for another SCSI device. This option is intended for

systems that use COPY and is implemented by the drive.

When set to 1, the drive is reserved for the SCSI device whose ID appears in

the Third Party Device ID field. The drive ignores any attempt made by any

other initiator to release the reservation and returns a GOOD status.

When set to 0, no third-party reservation is requested and the drive is reserved

for the initiator that issued the CDB.

Third Party

Device ID

If 3rdPty is set to 1, indicating that an initiator has reserved the drive for

another SCSI device, this field contains the ID number of the SCSI device for

which the reservation was made.

SDLT 600

SCSI Interface Guide

SCSI Commands

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REV A01

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Quantum 1200 Series DAT Autochanger Guía de usuario Pagina 272