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From: peterb@telerama.lm.com (Peter Berger)
Newsgroups: comp.os.386bsd.questions
Subject: Re: FreeBSD 2.0: SCSI problems
Date: 12 Jan 1995 19:06:24 -0500
Organization: Telerama Public Access Internet, Pittsburgh, PA USA
Lines: 37
Message-ID: <3f4g60$jp1@ivory.lm.com>
References: <A0045.95Jan12111714@roxi.rrz.Uni-Koeln.DE>
NNTP-Posting-Host: ivory.lm.com
In article <A0045.95Jan12111714@roxi.rrz.Uni-Koeln.DE>,
Jochen Roderburg <a0045@roxi.rrz.Uni-Koeln.DE> wrote:
>nate@FreeBSD.org wrote here (I lost the original reference):
>
>>> Saying it works under DOS doesn't necessarily mean anything, and it's
>>> possible that the Linux drivers doesn't use the devices as 'hard' as the
>>> FreeBSD driver. Basically, termination problems might not show up until
>>> the system is used heavily enough to cause 'reflections' to wipe out
>>> good date on the wire.
>
>Is it possible to understand in which way FreeBSD uses SCSI devices *harder*
>than Linux? I ask because I have various similar SCSI problems on two
>systems under FreeBSD which do not show up at all under Linux
>(and of course not under DOS/Windows).
>
SCSI problems are very pernicious. They don't always show up
deterministically, especially under different operating systems.
> aha0: MBO not free
> sd0(aha0:0:0): timed out
> adapter not taking commands.. frozen?!
> Debugger("aha1542") called.
> sd0(aha0:0:0): timed out
> adapter not taking commands.. frozen?!
> Debugger("aha1542") called. AGAIN
I ran into the exact same problem. To fix it, I needed to turn off
synchronous access on -both- the host adapter and the drive.
Good luck.
--
......................................................................
Peter G. Berger, Esq. Telerama Public Access Internet, Pittsburgh
Internet: peterb@telerama.lm.com Phone: 412/481-3505 Fax: 412/481-8568
http://www.lm.com/~peterb