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RELEASE UNIT 6.Command Specification
SONY AIT-3Ex drive SDX-800V series Ver.1.1 6-79
6.18. RELEASE UNIT (6/10) 17h and 57h
Table 6-80: Release UNIT 6 CDB format
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (17h)
1 Reserved Obsolete
2 Reserved
3 Reserved
4 Reserved
5 Control
Table 6-81:Release UNIT 10 CDB format
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (57h)
1 Reserved 3rdPty Reserved LongID Obsolete
2 Obsolete
3 Third Party Device ID
4 Reserved
5 Reserved
6 Reserved
7-8 Parameter List Length
9 Control
RELEASE UNIT releases the drive if it was reserved by the requesting initiator using a RESERVE (6/10) command
and is still in the reserved state. See PERSISTENT RESERVE OUT/IN for an alternate reservation system. This
command cannot release a reservation generated by the PERSISTENT RESERVE OUT command.
Third party reservation management operations are only allowed using RESERVE (10) and RELEASE (10).
Logical Unit reservation management operations are allowed using RESERVE (6/10) and RELEASE (6/10).
3rdPty: The Third-Party release option for the RELEASE UNIT command allows an initiator to release a logical unit
that was previously reserved using the Third-Party reservation option.
If the 3rdPty bit is ZERO, then the Third-Party release option is not requested. If the 3rdPty bit is one, then the drive
is released, if the reservation was made using the Third-Party reservation option by the initiator that is requesting the
release and for the same SCSI device as specified in the Third-Party Device ID field.
Obsolete: The Obsolete fields must be set to ZERO.
If the value in any Obsolete field is not ZERO, the command is terminated with CHECK CONDITION status and the
Sense Key is set to ILLEGAL REQUEST. The Additional Sense Code is set to INVALID FIELD IN CDB.
3
rd
Party: Third Party Release allows an initiator to release a logical unit that was previously reserved for third party
operations.
If the value in this field is 0b, a Logical Unit release is not requested.
If 3rdPty = 1b, the Logical Unit releases the specified logical unit, but only if the initiator, 3rdPty bit, and Third Party
Device ID fields (in CDB or in Parameter List) are identical when compared to the values used in the RESERVE (10)
command that established the reservation.
Long ID: If the Long ID bit is set to 1b and the Parameter List Length is 8, the parameter list contains the eight bytes
of the device ID of the Third Party Device ID.
If the 3RDPTY bit is zero, the LONGID bit field is ignored.
This is required for Fiber Channel since each Device ID is at least three bytes long.