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Re: [Xen-users] Xen with LVM

The lomount tool - originally from qemu but also distributed with Xen - makes 
it more straightforward to mount partitions within an image file.  It handles 
calculation of offsets etc for you.  This is what I generally use to access 
partitions within a virtual disk.

The other tool folks sometimes use is "kpartx", which I believe supports 
partitions using device mapper.

In either case the end result is much the same: a friendlier way of accessing 
partitions within an image.

Don't worry about sfdisk grumbling at you, ISTR that's normal.

Hope this helps,


On Friday 12 October 2007, Errol Neal wrote:
> Quoting "IDAGroup - R.W.Muller" <robin@xxxxxxxxxxx>:
> > Hello Errol, I tried that and get a little weird partition table:
> >
> > sfdisk -l -uS /dev/vms/centos5_data
> >
> > Disk /dev/vms/centos5_data: 0 cylinders, 0 heads, 0 sectors/track
> > Warning: The partition table looks like it was made
> >  for C/H/S=*/255/63 (instead of 0/0/0).
> > For this listing I'll assume that geometry.
> > Units = sectors of 512 bytes, counting from 0
> >
> >   Device Boot    Start       End   #sectors  Id  System
> > /dev/vms/centos5_data1   *        63   3068414    3068352  83  Linux
> > /dev/vms/centos5_data2             0         -          0   0  Empty
> > /dev/vms/centos5_data3             0         -          0   0  Empty
> > /dev/vms/centos5_data4             0         -          0   0  Empty
> I wouldn't worry too much about that. sfdisk is probably just
> confused. Since the file doesn't have a ioctl, that would be my guess
> > Now I just have to find out, how I can get ride of the Empty partitions
> > and how to use snapshot for backup and I'm getting closer
> > to a usable result :)
> lvcreate -L1G -n vmsnap /dev/vms/centos5_data
> Then mount it as above. Keep in mind that for snapshots, all changes
> to the live volume are written to the COW table on the snapshot
> volume. Make sure you allocate enough space for this.
> -Errol
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