Date: Mon, 7 Feb 2000 13:34:26 -0700 From: "Kenneth D. Merry" <ken@kdm.org> To: alvermark@teligent.se Cc: scsi@FreeBSD.ORG Subject: Re: Problems with Adaptec card and FreeBSD 2.2.2 (fwd) Message-ID: <20000207133426.A23334@panzer.kdm.org> In-Reply-To: <Pine.BSF.4.10.10002070801150.89856-100000@teligent.se>; from jakob@teligent.se on Mon, Feb 07, 2000 at 08:02:21AM %2B0100 References: <Pine.BSF.4.10.10002070801150.89856-100000@teligent.se>
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On Mon, Feb 07, 2000 at 08:02:21 +0100, Jakob Alvermark wrote:
> Maybe someone on this list can help me with this problem?
>
> There are two different card models, "2940 UW" and "2944 AU".
> And I know that 2.2.2 is quite old, but we can't just reinstall all the
> machines in a snap. This is a large and complex telecommunications system
> with several machines running FreeBSD, and over two million customer, so
> you see my problem.
I'll repeat my answer for the benefit of the folks on -scsi:
> On Thu, 3 Feb 2000, Peter Schwenk wrote:
>
> > You neglected to tell us the model of Adaptec SCSI card you are using. Also,
> > you do realize that FreeBSD 2.2.2 is a bit old. The last version of the 2.x
> > line was 2.2.8.
> >
> > Jakob Alvermark wrote:
> >
> > > Hi All.
> > >
> > > We are having problems with FreeBSD 2.2.2 and some Adaptec SCSI card.
> > > This is the errors showing on the screen:
> > >
> > > "Timed Out in dataout phase.
> > > SCSISIGI=0xe6
> > > SEQADDR=0x133
> > > SCSISEQ=0x12
> > > Issued Cannel A bus reset.
> > > 2 SCB's aborted "
> > >
> > > "The SCSI bus had locked up or lost connection with the harddrive
> > > again."
> > >
> > > I have only heard a rumor that there might be a problem with FreeBSD 2.2.2
> > > and the Adaptec SCSI cards and heavy load. Is this true?
> > >
> > > This has happened to several machines. It seems to happen about once every
> > > week. The machines have quite heavy load at times.
> > >
> > > Is this a known problem? How to fix? Change SCSI-card to a different
> > > brand? Upgrade to a newer release of FreeBSD?
The "timed out in {datain|dataout|command}" phase messages almost always
mean there is a cabling or termination problem on the bus. It means a
signal got stuck on the bus somewhere.
There were certainly bugs in the old SCSI layer that could get triggered
under heavy load, but this isn't one of them.
These sorts of problems can be intermittent, so it isn't surprising that
you see them once a week under high load.
The new Adaptec driver and the CAM SCSI layer handles problems like this a
little better, but there are still no guarantees when signals are getting
stuck on the bus.
So check your cabling and termination.
Ken
--
Kenneth Merry
ken@kdm.org
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