[linux-lvm] F7 will not boot after running backup w/snapshot
Stuart D. Gathman
stuart at bmsi.com
Fri May 2 00:47:30 UTC 2008
ZZZZOn Thu, 1 May 2008, Charles Marcus wrote:
> In Gerry's scenario here, if the snapshot volume had NOT been on a ram
> disk, would he have had the problem he had or not?
Here is the snip from Fedora/RHEL for activating the VG containing
the root filesystem (note: kernel modules and lvm command are contained in
initrd filesystem, and do not depend on /lib/modules/...):
echo "Loading dm-mod.ko module"
echo "Loading dm-mirror.ko module"
echo "Loading dm-zero.ko module"
echo "Loading dm-snapshot.ko module"
echo Making device-mapper control node
echo Scanning logical volumes
lvm vgscan --ignorelockingfailure
echo Activating logical volumes
lvm vgchange -ay --ignorelockingfailure rootvg
This will fail if any of the physical volumes are missing. More logic
in initrd is required to boot with missing PVs.
So yes, a ram disk is guaranteed to be missing on reboot, and thus to
fail in the RH/Fedora distros. There is no problem taking snapshots
of the root fs otherwise. If there is a robust way to reduce
missing PVs automagically in the above script from initrd, Fedora could
use the contribution.
Stuart D. Gathman <stuart at bmsi.com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
More information about the linux-lvm