I'm trying to mount a disk image that contains an LVM volume.
I've managed to follow this tutorial to the point where I've
got the volume on `/dev/loop7':
http://www.thegibson.org/blog/archives/467
Now I want to mount the image. My machine, a CentOS machine,
is already using LVM; running `lvm pvscan' shows me that the
the disk image has been stuck in `VolGroup00' with the rest of
them:
:; lvm pvscan
PV /dev/loop7 VG VolGroup00 lvm2 [7.88 GB / 0 free]
PV /dev/sda5 VG VolGroup00 lvm2 [133.06 GB / 0 free]
PV /dev/sdb2 VG VolGroup00 lvm2 [135.16 GB / 0 free]
Total: 3 [276.09 GB] / in use: 3 [276.09 GB] / in no VG: 0 [0 ]
At this point in the tutorial, I run in to trouble. As they
suggest, I run `lvm vgchange -ay' and then inspect
`/dev/mapper':
:; lvm vgchange -ay
2 logical volume(s) in volume group "VolGroup00" now active
2 logical volume(s) in volume group "VolGroup00" now active
:; ls /dev/mapper/
control VolGroup00-LogVol00 VolGroup00-LogVol01
Mounting fails:
:; mount -t ext2 /dev/mapper/VolGroup00-LogVol01 /media/img/
mount: /dev/mapper/VolGroup00-LogVol01 already mounted or /media/img/ busy
:; mount -t ext2 /dev/mapper/VolGroup00-LogVol00 /media/img/
mount: /dev/mapper/VolGroup00-LogVol00 already mounted or /media/img/ busy
mount: according to mtab, /dev/mapper/VolGroup00-LogVol00 is mounted on /
At this point, I'm stuck. I've tried removing `/dev/loop7'
from the volume group, to no avail:
:; vgcreate shim /dev/loop7
Physical volume '/dev/loop7' is already in volume group 'VolGroup00'
Unable to add physical volume '/dev/loop7' to volume group 'shim'.
:; vgreduce VolGroup00 /dev/loop7
Physical Volume "/dev/loop7" not found in Volume Group "VolGroup00"
What's the right way to mount and LVM disk image? I'm doing it
to perform maintenance on a Xen guest.
--
Jason Dusek
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