User Manual

SCSI Commands Reference Manual, Rev. J 196

www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)

3.38 RESERVE(6) command

This command has been declared obsolete by the T10 committee. However, it is included because it may be implemented on

some products.

The RESERVE(6) command (see table 165) is used to reserve a logical unit. This subclause describes only those instances where

the RESERVE(6) command differs from the RESERVE(10) command. Except for the instances described in this subclause, the

RESERVE(6) command shall function exactly like the RESERVE(10) command (see 3.39).

Obsolete Bits 1 through 4 of Byte 1 provided a method, limited to device addresses 0 through 7, to handle third-party

reservations in earlier versions of the SCSI standard. The obsolete method has been replaced by the RESERVE(10) and

RELEASE(10).

Byte 1 Bit 0 and Bytes 2 through 4 provide an obsolete way to reserve extents within a logical unit. The Seagate device server

does not support the feature--if it is set, it will be rejected with an ILLEGAL REQUEST/INVALID BIT IN THE CDB. The Seagate device

server ignores the Obsolete field for the Reservation ID.

Table 165 RESERVE(6) command

Bit

Byte

7 6 5 4 3 2 1 0

OPERATION CODE (16h)

Reserved Obsolete

Obsolete

CONTROL