Hi Bryn,
many thanks for the info. I'm going to read kpartx documentation.
Regards,
Marc
Bryn M. Reeves wrote:
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Marc Patino Gómez wrote:
Hi list,
I am searching a way to backup a "special" logical volume. This special
lv doesn't contains a filesystem, it contains a hole image disk of a
running server (MBR,Partition Table, Partitions and filesystems), in
fact it is a VBD (Virtual Block Device) of a HVM Xen Guest.
I want to be able to make the backup without shutting down the Virtual
Machine, but the traditional way :
- make a snapshot
- mount snapshot
- backup the snapshots
- umount snapshot
- remove snapshot
is not suitable for this kind of logical volumes.
I search some information about it, but the only clue is:
fdisk -l -u /dev/vg00/lv00
Hi Marc,
You can use the kpartx tool for this. It was originally written as part
of multipath-tools and it allows you to map the partitions on a
device-mapper device like an LVM2 logical volume.
E.g. you would run:
# kpartx -a /dev/vg00/lv00
And that will scan lv00 for partitions and create new devices in
/dev/mapper named lv00p1, lv00p2, ... that you can then use to access
the content of the partitions.
When you're done, run:
# kpartx -d /dev/vg00/lv00
To remove the temporary kpartx maps.
Regards,
Bryn.
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