Reference Guide

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