Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E 185
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5.2.2.12
Release (10) Command (57h)
The RESERVE and RELEASE commands provide the basic mechanism for contention resolution in multiple-
initiator systems. The RELEASE command (Table 5.2.2-12) is used to release a previously reserved logical
unit, or, if the extent release option is implemented, to release previously reserved extents within a logical
unit. It is not an error for an initiator to attempt to release a reservation that is not currently valid. In this case,
the drive shall return GOOD status without altering any other reservation.
Table 5.2.2-12. Release (10) Command
Bit
7
6
5
4
3
2
1
0
Byte(s)
0
Operation Code (57h)
1
Logical Unit No. [1]
3rdPty
Reserved
Extent
0
0
0
[2]
0 [3]
2
Reservation Identification
[4]
3
Third Party Device ID
[2]
4
Reserved
5
Reserved
6
Reserved
7
Reserved
8
Reserved
9
Control Byte
[5]
Notes:
[1] The Logical Unit Number must be ZERO.
[2] If bit 4 is zero, bits 3, 2, and 1 are zeros. If bit 4 is one, bits 3, 2, and 1 identify the SCSI bus ID of the
device that reserves the drive.
[3] Must be zero
[4] Must be zero if not supported. Check with drive Product Manual, “SCSI Interface commands supported”
section (see paragraph 5.2.1.8.1).
[5] See “Control Byte” paragraph 4.2.6.
For additional explanation about the Release Command, see section 5.2.1.9.
