Problem with dump stalling
Kevin Oberman
oberman at es.net
Wed Oct 8 10:01:42 PDT 2008
> Date: Wed, 8 Oct 2008 01:54:12 -0700
> From: Jeremy Chadwick <koitsu at FreeBSD.org>
> Sender: owner-freebsd-stable at freebsd.org
>
> On Wed, Oct 08, 2008 at 10:29:00AM +0200, David Peall wrote:
> > Hi
> >
> > If I have the wrong list please feel free to redirect me.
> >
> > I'm running 7.0-RELEASE-p4 and trying to backup to an external USB
> > drive.
> >
> > I'm using the following command
> >
> > dump -a0Lf /backup/diskimages/root /dev/mfid0s1a
> >
> > Where df:
> >
> > Filesystem 1K-blocks Used Avail Capacity Mounted on
> > /dev/mfid0s1a 507630 208436 258584 45% /
> > /dev/da1s1d 709513458 9853800 642898582 2% /backup
> >
> > The following processes start
> >
> > 75399 p0 I+ 0:00.04 dump -a0Lf /backup/diskimages/root /dev/mfid0s1a (dump)
> > 75402 p0 S+ 0:00.71 dump: /dev/mfid0s1a: pass 4: 77.05% done, finished in 0:00 at Wed Oct 8 08:25:06 2008 (dump)
> > 75403 p0 S+ 0:00.85 dump -a0Lf /backup/diskimages/root /dev/mfid0s1a (dump)
> > 75404 p0 S+ 0:00.96 dump -a0Lf /backup/diskimages/root /dev/mfid0s1a (dump)
> > 75405 p0 S+ 0:00.86 dump -a0Lf /backup/diskimages/root /dev/mfid0s1a (dump)
> >
> > But it just stops at a random percentage, the system continues to run
> > and the processes are killable?
> >
> > Perhaps I'm using dump incorrectly if anyone could help would be greatly
> > appreciated.
>
> This is a known problem with dump on UFS2 filesystems. See
> "dump/restore" here:
>
> http://wiki.freebsd.org/JeremyChadwick/Commonly_reported_issues
>
> There is no fix, AFAIK.
>
> My recommendation is to use something else. I'm particularly fond of
> rsnapshot, but be aware that rsync will cause file atimes to be lost
> (on the source) when copying; this can impact classic UNIX mail
> spools (mbox), where people use clients like mutt/pine which utilise
> atimes to determine if there's new mail or not.
I had a system that was showing these exact symptoms David described. It
did this both with -L and without. I went for about 3 months without a
successful dump. I did at least two full system re-installs to no
avail. Then, about 3 weeks ago, when I was about to start some serious
debugging, it started working again. Nothing was touched between the
last failure and the first success. I'm completely baffled!
--
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
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