Release (6) Command (17H) - Maxtor Atlas 10K V Product Manual

5.28

RELEASE (6) Command (17h)

The 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 5-155 and Table 5-156 respectively.
Table 5-155
Bit
Byte
0
1
2
3 - 4
5
Table 5-156
Field
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
When the value is 1, the drive releases the specified logical unit, but only if the reservation 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.
Required if the 3rdPty bit is 1. This field specifies the SCSI ID (0 through 7 only) of the initiator
Third Party Device
whose third party reservation is being released. (This field must be set if the initiator of the original
ID
third party RESERVE is the source of the RELEASE.)
Extent The drive supports reservations only on entire logical units. The value must be 0.
Reservation
Any value in this field is ignored by the drive.
Identification
Note:
RELEASE (6) Command Descriptor Block-Data Format
7 6 5
Reserved
RELEASE (6) Command -Field Descriptions
Assuming that the RELEASE Command Descriptor Block is valid, the drive
always returns a GOOD status for this command. An actual release only hap-
pens if the initiator has the unit reserved for itself or a third-party initiator.
4 3
Operation Code (17h)
3rdPty Third Party Device ID
Reservation Identification
Reserved
Control
Description
Maxtor Atlas 10K V
2 1 0
Extent
5-109