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101

Chapter 4 SCSI Commands

RESERVE (10) Command (56h)

DLT-S4 Interface Reference Guide 318

RESERVE (10) Command (56h) 4

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 175, and the data

fields are described in table 157

. If RESERVE (10) is used, RELEASE (10)

must also be used.

Table 175 RESERVE (10)

Command Descriptor Block —

Data Format

Note:

This command has been made obsolete in the latest version of

SCSI-3 and should not be used with any new implementations.

The tape drive supports this command for legacy applications

only.

Bit

7 6 5 4 3 2 1 0

Byte

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

1 2 ... 347 348 349 350 351 352 353 354 355 356 357 ... 385 386

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