Maxtor 10K III manual Release 6 Command Descriptor Block-Data Format

SCSI Description

￿￿￿￿4'.The'#5'￿￿￿￿￿%QOOCPF￿￿￿￿J￿RELEASE and the RESERVE commands are used for contention resolution in multiple-initiator systems. The RELEASE command is used to release a previously reserved logical unit. The drive will not return an error if the initiator attempts to release a reservation that is not currently valid. The data format and field descriptions are shown in Table -161and Table 5-162respectively.

RELEASE (6) Command Descriptor Block-Data Format

$[VG0$KV

￿

￿

￿

Operation￿

Code￿(17h)

￿

￿

￿

1

Reserved

3rdPty

Third Party Device ID

Extent

2

Reservation Identification

3 - 4

Reserved

5

Control

RELEASE (6) Command -Field Descriptions

Third Party Release allows an initiator to release a logical unit that was previously

reserved. If the value in this field is 0, third party release is not requested.

3rdPty(KGNF

When the value is 1, the drive releases&GUETKRVKQPthe specified logical unit, but only if the res-

ervation was made by the initiator using a third-party reservation that requested the

release for the same SCSI device as specified in the Third Party Device ID field.

Third Party De-

Required if the 3rdPty bit is 1. This field specifies the SCSI ID (0 through 7 only) of

the initiator whose third party reservation is being released. (This field must be set

vice ID

if the initiator of the original third party RESERVE is the source of the RELEASE.)

Table5-161

Extent

The drive supports reservations only on entire logical units.

Reservation

Any value in this field is ignored by the drive.

6JG￿XCNWG￿OWUV￿DG￿￿￿

Identification

Assuming that the RELEASE Command Descriptor Block is valid, the drive

always returns a GOOD status for this command. An actual release only hap-

Note:Tablepens5if-162the initiator has the unit reserved for itself or a third-party initiator.

5-126 Maxtor Atlas 10K III