Reserve Unit Command 16h | Quantum Instruments DLT 7000 guide

SCSI Commands

5.19RESERVE UNIT COMMAND (16h)

The RESERVE UNIT command reserves the specified tape drive for exclusive use by the requesting initiator or for another specified SCSI device.

Bit

Byte

Operation Code (16h)

Logical Unit Number

3rdPty

Third Party Device ID

Rsv’d

2 - 4

Reserved

Unused

Reserved

Flag

Link

Figure 5–74 RESERVE UNIT Command Descriptor Block - Data Format

Table 5–73

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 tape drive.

If set to 1, logical unit is reserved for the SCSI device whose ID appears in the Third

Party Device ID field. The tape drive ignores any attempt made by any other

initiator to release the reservation and returns a GOOD status.

If set to 0, no third party reservation is requested and device is reserved for the

initiator that issued the CDB.

Third Party

If 3rdPty is set to 1 (indicating that an initiator has reserved the logical unit for

Device ID

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

which the reservation was made.

Quantum DLT 7000 Tape System

5-155

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Quantum Instruments DLT 7000 manual Reserve Unit Command 16h

Models: DLT 7000