Dell PowerVault TL2000 - Manual (Page 79)

RELEASE 6 (17h)
The RELEASE command is used to release a previously reserved logical unit.
Bit 7 6 5 4 3 2 1 0
Byte
0 Operation Code (17h)
1 LUN Obsolete
2 Obsolete
3 Reserved
4 Reserved
5 Control
Field descriptions:
Chapter 3. Supported SCSI Commands 3-65