Fujitsu M2488 manual Release Unit Operation, Release Unit Sense Keys

TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE

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		DESCRIPTION
1h	RECOVERED ERROR	Recovery was performed while writing buffered data before the
		RELEASE UNIT occurred.
3h	MEDIUM ERROR	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.
4h	HARDWARE ERROR	Write of buffered data failed due to a hardware failure.
5h	ILLEGAL REQUEST	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.
6h	UNIT ATTENTION	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.
Bh	ABORTED COMMAND	The RELEASE UNIT command was aborted.

4-102 CG00000-011503 REV. A April 1997