[101664] in RedHat Linux List
Re: lockups during backups
daemon@ATHENA.MIT.EDU (Steve Hazelett)
Sat Nov 28 10:11:10 1998
From: Steve Hazelett <hazelett@aa.net>
Date: Sat, 28 Nov 1998 07:04:25 -0800 (PST)
To: redhat-list@redhat.com
In-Reply-To: <199811280539.VAA06158@belvdere.vip.best.com>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
Dave,
Just thought I would throw out a couple of things. You may have
already tried these. After you reboot, check to see what's in
/var/log/messages. I'm not familiar with KDAT or your tape drive but
check any log files that KDAT might create. Of course clean the drive
and/or try another tape. You might also try writing the backup to a
file on your HD. If this works ok every time, then it's a pretty good
chance that it's hardware related, not software. fsck'ing the HD before
backup is not a bad idea either.
You didn't mention how many bytes you were trying to back up, but two
hours seems a bit steep. I usually backup (at work with tar) a 1G drive
in about 30-40 minutes. Maybe re-tries are causing this problem.
I once tried using an off the shelf SCSI cable with HPUX on a HP382
system (in place of the HP cable) and got nothing but problems.
Re-installing the HP cable made everything work correctly again. SCSI
cables, especially cheap ones, can cause you problems. Try using as
short of one as possible. Also check to see if you should be using a
active or passive termination.
I know there is something different for termination, depending upon
how long the SCSI cable is, but I can't recall the spec at the moment I
saw this on the Web some place (an official document). The document
talked about a difference in termination on longer SCSI cables. Maybe
someone else knows what/where this spec is.
Just some thoughts.
... Steve
"David E. Fox" <dfox@belvdere.vip.best.com> wrote:
> After doing some more backups and experimentation with the
> tape drive I have (HP Surestore DAT) and a SCSI (Adaptec 2920C)
> card, I've noticed that frequently (but not always) the system
> will lock up solid (i.e., have to turn the system off) after the
> backup has been going on for a while.
>
>
>
------------------------------------------------------------------------
> David E. Fox Tax Thanks for letting me
> dfox@belvdere.vip.best.com the change magnetic patterns
> root@belvedere.sbay.org churches on your hard disk.
>
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hazelett@aa.net
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