*BSD News Article 24301


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From: cik@ukc.ac.uk (C.I.King)
Newsgroups: comp.os.386bsd.questions
Subject: Trouble with Adaptec 1542C & 6 Toshiba XM3401 CDROM drives
Date: Mon, 22 Nov 93 11:03:24 GMT
Organization: Computing Lab, University of Kent at Canterbury, UK.
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Sender: cik@ukc.ac.uk
Distribution: world
Message-ID: <10@plato.ukc.ac.uk>
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	Hello! I have a problem with my ADAPTEC 1542C SCSI card. I have
	6 Double Speed CD-ROM drives mounted and after some intensive
	similtaneous long sequential reads (>15Mb) of the CD-ROMs the
	card resets all the drives. With the debugging on in the adaptec
	driver, I get the error message:

		op=28 0 0 3 a3 10	<- I always get op=28
		stat 4 for mbi[15]	<- these vary for different 
		addr= 0xfe087ca4	<- CD-ROMs

	My hardware:	Viglen Genie Professional, 4DX33, 8Mb RAM
			Adaptec 1542C SCSI card (ed0 at 0x280-0x29f irq 5
						 maddr 0xd8000)
			6 TOSHIBA XM3401 Double Speed SCSI drives.
			
	If I increase the AHA_CMD_TIMEOUT_FUDGE setting, then the problem 
	seems to occur less often. I expect it is because my machine is 
	faster than the typical 386SX, which probably works correctly 
	with the driver, but I am just guessing.  Anybody care to advise?
	
		Thanks in advance, Colin King