aha1542 and Archive 2150 Panic broblem solved

[Petri Alhola]

	I told about one month ago, that i have problems with
	1542 SCSI controller and Archive 2150 SCSI Streamer tape. 
	I found actual bug with help of Interactive systems technical
	support. The problem was that Faulty Tape Cardrdge caused Kernel
	Panic. It seems that there may be bug in aha 1542/ 1540 driver
	that when it receives error from tape drive it hangs SCSI bus and
	makes disk io inpossible and then causes panic. There is no afect if
	you change tape or disk drives, controllers or motherboards, If you
	have got box of faulty tapes, it will panic when you try to use these.

	Now the SCSI tape works nicely, i can now backup all of our systems
	over NFS with gnu tar.

	Petri Alhola
	petri at digiw.fi