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Re: [Xen-users] Xen with LVM

Thanks Mark, I'm going to try that, but does lomount also work with LVM or just if I would use a image file?
..I figured that LV's are the safer choice for a productive environment then image files, because tests showed me
that the image file puts a lot more load on dom0 then the LV's do.


Mark Williamson wrote:
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.


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