HP LTO 4 FC 6h-UNIT ATTENTION, Action, The Persistent Reservation holder has tried to release the

Code	Meaning	Comments
26 04	Invalid release of persistent	The Persistent Reservation holder has tried to release the
	reservation	persistent reservation using the PERSISTENT RESERVE OUT
		command, but the Scope or Type supplied was invalid.
2C 00	Command sequence	The sequence of SCSI commands is invalid.
	invalid	Example 1: The use of the echo buffer was invalid. A
		WRITE BUFFER command is necessary before a READ
		BUFFER command.
		Example 2: Another initiator has already started a
		firmware download process.
2C 0B	Not reserved	If the “Only If Reserved” bit is set in the Device
		Configuration Mode page, and the drive does not hold a
		(persistent) reservation, some commands will not be
		allowed to execute. In other words, some commands can
		only be executed if the drive is reserved.
3B 0C	Position past BOM	A SET CAPACITY command was received when the
		logical position was not BOT, a necessary condition for
		this command.
53 02	Medium removal prevented	An unload operation failed to eject the tape because
		medium removal has been prevented.
55 03	Insufficient resources	A buffer has reached its full capacity.
55 04	Insufficient registration	FC interface only: There is only space for requests from
	resources	32 initiators to register, using PERSISTENT RESERVE OUT
		commands.
55 06	Media Auxiliary Memory	There is insufficient space in the Host Attribute area in
	full	MAM to fit the attribute that need to be written.
	Action:	Check MAM attribute 0004h (MAM Space Remaining)
		to identify how much space remains in MAM.

6h—UNIT ATTENTION

Code	Meaning		Comments
28 00	Not ready to ready		A tape has been loaded successfully into the drive and is
	transition		now ready to be accessed.
		Action:	1.	The host should be polling, receiving a CHECK
				CONDITION with sense key 2h (NOT READY) and
				additional sense of 04 01h (LUN in process of
				becoming ready), and expecting this transition.
			2.	Send the console message: “Tape drive in process of
				becoming ready”.
			3.	After the transition, send the console message “Tape
				loaded - media may have changed”.

HP LTO Ultrium 4 drives technical reference manual, volume 2: software integration 69 HP restricted