Date: Tue, 12 Aug 2014 22:07:38 +0200 From: Roland Smith <rsmith@xs4all.nl> To: Andrew Hamilton-Wright <AHamiltonWright@mta.ca> Cc: freebsd-questions@freebsd.org Subject: Re: Problems with dump and restore Message-ID: <20140812200738.GD7166@slackbox.erewhon.home> In-Reply-To: <alpine.BSF.2.11.1408121641480.1074@qemg.org> References: <alpine.BSF.2.11.1408121255230.1074@qemg.org> <20140812193419.GB7166@slackbox.erewhon.home> <alpine.BSF.2.11.1408121641480.1074@qemg.org>
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On Tue, Aug 12, 2014 at 04:48:17PM -0300, Andrew Hamilton-Wright wrote:
>=20
> > This is mentioned in the restore's manpage;
> >
> > expected next file <inumber>, got <inumber>
> > A file that was not listed in the directory showed up. Thi=
s can
> > occur when using a dump created on an active file system.
>=20
> True, but my understanding of snapshots is that it is supposed to
> eliminate exactly this problem, no?
Yes, it should. But while UFS is old and mature and one would expect most b=
ugs
to be fixed by now, relatively new additions like SU+J will probably have m=
ore
bugs. (No slight to the maintainers intended, BTW! FreeBSD is generally
rock-solid in my experience)
> >> Some questions then:
> >> - is anyone else using dump/restore as their main backup method?
> >
> > Yes, operating system filesystems like /, /usr and /var, which can cont=
ain
> > flags and hard links and such. These filesystem's aren't all that big, =
so
> > dumps are relatively quick.
>=20
> What options are you using? Are you using dumplevels?
Generally I only use level 0 dumps for ease of restore. I use the following
script to make dumps from single user mode. To save on disk space I don't d=
ump
those parts of /usr that can be easily downloaded, like src and ports. This=
is
accomplished by setting =E2=80=98nodump=E2=80=99 flags and using dump's =E2=
=80=98-h 0=E2=80=99 option.
Note that I've put /tmp on a separate filesystem; I need someplace to store
the dumps on. :-)
#!/bin/sh
# Shell script to perform dumps on all important filesystems.
# This script is designed to run under single-user mode from /root.
#
# Author: R.F. Smith <rsmith@xs4all.nl>
# $Date: 2014-04-13 20:05:32 +0200 $
#
# To the extent possible under law, Roland Smith has waived all copyrig=
ht and
# related or neighboring rights to dodumps. This work is published from=
the
# Netherlands. See http://creativecommons.org/publicdomain/zero/1.0/
export PATH=3D/sbin:/bin:/rescue
export DDATE=3D$(date "+%Y%m%d")
export DLVL=3D0
export DDIR=3D/tmp
# Enumerate the mount points to dump.
MNTS=3D"/ /usr /var"
echo -n "Setting nodump flags..."
chflags nodump /usr/obj /usr/ports /usr/src /usr/local/texlive/2013
echo "done."
echo -n "Unmounting filesystems before dumping..."
cd /root
mount -u -r /
umount -f /usr
umount -f /var
echo "done."
echo "Performing level "$DLVL" dump for mount points "$MNTS"."
for p in $MNTS; do
case $p in
'/') export FSNAME=3D/root;;
*) export FSNAME=3D${p};;
esac
OUTF=3D${DDIR}${FSNAME}-${DLVL}-${DDATE}.dump
# Set the dump command options.
echo "Dumping $p to $OUTF"
DCMD=3D"dump -${DLVL} -a -b 64 -C 32 -R -h 0 -f ${OUTF} "
$DCMD $p
done
echo "Done making dumps."
echo -n "Re-mounting filesystems after dumping..."
mount -u -w /
mount /usr
mount /var
echo "done."
> >> - does anyone have any advice that may help determine what may have
> >> gone wrong?
> >
> > Try using restore's =E2=80=9Cdegraded=E2=80=9D mode (using the =E2=80=
=98-D=E2=80=99 option) and use the =E2=80=98-y=E2=80=99
> > option.
>=20
> I have started that running on a scratch device, and will report back with
> results.
Good luck!
Roland
--=20
R.F.Smith http://rsmith.home.xs4all.nl/
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