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RESERVE (10) Command (56h) SDLT 600 SCSI Interface Guide

4-228 January 2005 81-81200-02 REV A03

4.28 RESERVE (10) Command (56h)

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 and RELEASE commands provide contention resolution in multiple-initiator systems.

The RESERVE command reserves a logical unit number. The RESERVE (10) CDB is shown in

Figure 4-122, and the data fields are described in Table 4-132. If RESERVE (10) is used, RELEASE

(10) must also be used.

Figure 4-122. RESERVE (10) Command Descriptor Block — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (56h)

1 Reserved 3rdPty Reserved LongID Extent (0)

2 Reservation Identification

3 Third Party Device ID

4 - 6 Reserved

7 - 8

(MSB)

Parameter List Length

(LSB)

9 Control

SDLT 600

SCSI Interface Guide

SCSI Commands

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