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From: moto@CS.cmu.edu
To: hackers@freebsd.org
Subject: weird problem with AHA2490+EXABYTE 
Reply-To: moto@CS.cmu.edu
Date: Wed, 21 Jun 1995 10:20:37 -0400
Message-ID: <9688.803744437@GS81.SP.CS.CMU.EDU>
Sender: hackers-owner@freebsd.org
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Hello,

I'm having a problem with a EXABYTE 8205XL and AHA2940. Here is the
configuration:

	OS:	FreeBSD 2.0.5 (GENERIC kernel with CHILD_MAX=128 and pty=32)
			      (AHC_TAGENABLE is NOT defined)
	CPU:	Pentium 100MHz (GATEWAY2000 P5-100)
	Memory:	32M
	SCSI:	Adaptec 2940
	Disk:	Micropolis 3221 (2.0G) (external)
	CD:	Toshiba XM3501 (external)
	Tape:	EXABYTE 8205XL (external)

Without the EXABYTE, it just runs fine. When the EXABYTE is attached,
the machine reports bunch of "timeout on sd0" during dumping the
filesystem to a tape. I suspected the cable and termination, but both
were OK (I'm using active terminator and chaging a cable didn't help
either. I dettached Toshiba's CD-ROM, but I still had the same
problem, therefore the length of a cable is not a problem, I guess).
I tried to play the transfer rate of AHA2940. It slightly change the
behavior but didn't solve the problem completely.

The same tape unit is working just fine with anohter machine:

	OS:	FreeBSD 2.0.5 (GENERIC)
	CPU:	486DX2 50MHz (GATEWAY2000) 
	Memory:	16M
	SCSI:	Adaptec 1542B
	Disk:	Micropolis 2210 (1.0G) (external)
	CD:	Toshiba XM3401 (internal)
	Tape:	EXABYTE 8205XL (external)

So the tape unit itself is OK. 

>From this observation, there might a possibility that there is a
problem in EXABYTE and AHA-2940 combination. Does anyone experience
this problem? Any suggestion will be greatly appreciated!

==============================================================================
Motonori Shindou       Carnegie Mellon University       SCS Graduate Student
              e-mail: moto@cs.cmu.edu,  NiftyServe: GEG04056
  WWW: http://www.cs.cmu.edu/afs/cs.cmu.edu/user/moto/WWW/moto-home.html
                   TEL: 412-362-9636   FAX: 412-362-9634
==============================================================================