[101697] in RedHat Linux List
Re: lockups during backups
daemon@ATHENA.MIT.EDU (Jan Carlson)
Sat Nov 28 16:43:34 1998
Date: Sat, 28 Nov 1998 16:40:03 -0500
From: Jan Carlson <janc@iname.com>
To: RedHat Mailing List <redhat-list@redhat.com>
CC: dfox@belvdere.vip.best.com
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
"David E. Fox" wrote:
> > I'd suspect your problem is hardware related. Have you verified the
cabling
> > and termination? Try reseating the card and cables.
>
> Well, the cables are pretty new. Also I figure that the termination
> is right, since otherwise I would suspect that I wouldn't be able
> to see the scsi device at all.
Termination problems can be very elusive. With bad termination
you may be able to boot and run for awhile and see all devices too.
Some things work fine, then suddenly errors happen at odd times.
Sometimes termination problems can cause bad disk block errors.
You need exactly two items terminated for each scsi card,
and they MUST be at both ends of the cable. The internal
and any external cables count together as one cable,
with one end outside the box and one inside.
If you have 0, 1, or more than 2 items terminated, you have
bad termination, but things might sort of work, until you are
doing something critical.
Some adaptec controllers are famous for being picky about
termination.
Does the scsi bus activity light stay on when it locks up?
Hopefully you have an LED connected to the scsi card.
If that light stays on, the problem is definitely scsi cable,
termination,
scsi card configuration, or the tape drive and disks are not compatible.
If the light stays on the scsi bus has locked up and you have no
access to disk, so you probably just have to ctl-alt-del or reset.
--
Jan Carlson
janc@iname.com Scarborough, Ontario, Canada
Mailed with Netscape 4.5 on Red Hat Linux 5.2
--
PLEASE read the Red Hat FAQ, Tips, Errata and the MAILING LIST ARCHIVES!
http://www.redhat.com http://archive.redhat.com
To unsubscribe: mail redhat-list-request@redhat.com with
"unsubscribe" as the Subject.
