4-3.22.2 Release Unit Operation; 4-3.22.3 Release Unit Sense Keys - Fujitsu M2488 Product Manual

TAPE UNIT SCSI COMMANDS
4-3.22.2 RELEASE UNIT Operation
If a valid reservation exists for the Initiator-Target-LUN combination, the target releases the reser-
vation and returns GOOD status.
A reservation may only be released by the initiator that made it. It is not an error to attempt to
release a reservation that is not currently valid. In this case, the target returns GOOD status with-
out altering any other reservation.
Third Party Release allows an initiator to release a logical unit that was previously reserved using
a third-party reservation.
4-3.22.3 RELEASE UNIT Sense Keys
One of the following sense keys may be returned if a CHECK CONDITION was indicated:
SENSE KEY CONDITION
1h RECOVERED ERROR
3h MEDIUM ERROR
4h HARDWARE ERROR
5h ILLEGAL REQUEST
6h UNIT ATTENTION
Bh ABORTED COMMAND
4-102
Recovery was performed while writing buffered data before the
RELEASE UNIT occurred.
1. Write of buffered data failed due to a defective tape.
2. An attempt was made to write 36-track data on 18-track format-
ted medium.
Write of buffered data failed due to a hardware failure.
1. Reserved bit was found set in the CDB of the RELEASE UNIT
command.
2. The Flag bit was set but the Link bit was not set.
Indicates the RELEASE UNIT command was not performed due
to one of the following:
1. The tape cartridge may have been changed.
2. The target has been reset.
3. The Mode parameters have been changed by another initiator.
4. The version of the microcode has been changed (microcode
downloaded).
5. A cartridge was loaded with a tape length that is too long or too
short.
The RELEASE UNIT command was aborted.
CG00000-011503 REV. A
M2488 PRODUCT GUIDE
DESCRIPTION
April 1997