User Manual

SCSI Commands Reference Manual, Rev. J 174

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

3.31 RELEASE (10) command

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

some products.

3.31.1 RELEASE (10) command introduction

The RELEASE(10) command (see table 140) is used to release a previously reserved logical unit.

The RESERVE and RELEASE commands provide a basic mechanism for contention resolution in multiple-initiator systems. See

5.5.1 for a general description of reservations and the commands that manage them. A reservation may only be released by a

RELEASE command from the initiator that made it. It is not an error for an application client to attempt to release a reservation

that is not currently valid, or is held by another initiator. In this case, the device server shall return GOOD status without altering

any other reservation.

Byte 1 Bit 0 and Byte 2 provide an obsolete way to release previously reserved extents within a logical unit. If Byte 1, Bit 0 is equal

to one, device servers not implementing the obsolete capability shall terminate the command with CHECK CONDITION status

and the sense key shall be set to ILLEGAL REQUEST.

Table 140 RELEASE (10) Command

Bit

Byte

7 6 5 4 3 2 1 0

OPERATION CODE (57h)

Reserved 3RDPTY Reserved LONGID Obsolete

Obsolete

THIRD-PARTY DEVICE ID

Reserved

(MSB)

PARAMETER LIST LENGTH

(LSB)

CONTROL