DLT2000 SCSI Interface
8-100 DLT2000/DLT2700 Cartridge Tape Subsystem
8.4.17 RELEASE UNIT (17h)
Bit
7
6
5
4
3
2
1
0
0
Operation Code (17h)
Logical Unit Number
3rdPty
Third Party Device ID
Rsvd
Reserved
Byte
Unused
Flag
1
Link
Reserved
2
Reserved
3
Reserved
4
5
Figure 8-68 RELEASE UNIT CDB
RELEASE UNIT releases the drive if it is currently reserved by the requesting initiator.
It is not an error to attempt to release the drive if it is not currently reserved by the
requesting initiator. However, if it reserved by another initiator, the drive is not
released.
3rdPty
The third-party release option for RELEASE UNIT allows an initiator to release a
logical unit that was previously reserved using the third-party reservation option. If the
third-party (3rdPty) bit is zero, then the third-party release option is not requested. If
the 3rdPty bit is one, the drive is released if it was originally reserved by the same
initiator using the third-party reservation option, and if the device is the same SCSI
device that was specified in the third-party device ID field.
8.4.17.1 Medium Changer Considerations
The optional Element reservation feature defined for Medium Changer devices in SCSI-
2 is not supported, so the RELEASE command is defined the same as for the tape drive:
Only the whole loader unit can be released. Reserve/release of the Loader and Drive
LUNs are handled independently.
Summary of Contents for DLT 2500
Page 18: ...Table of Contents xviii DLT2000 DLT2500 DLT2700 Cartridge Tape Subsystem ...
Page 20: ...Revision History xx DLT2000 DLT2500 DLT2700 Cartridge Tape Subsystem ...
Page 146: ...Firmware Update From Tape 7 18 DLT2000 DLT2500 DLT2700 Cartridge Tape Subsystem ...
Page 291: ...DLT2000 SCSI Interface DLT2000 DLT2700 Cartridge Tape Subsystem 8 145 ...
Page 327: ...Sense Key Information C 6 DLT2000 DLT2500 DLT2700 Cartridge Tape Subsystem ...
Page 345: ...Index 8 DLT2000 DLT2500 DLT2700 Cartridge Tape Subsystem ...