[linux-lvm] Backuping "special" snapshots

[Marc Patino Gómez]

Hi again,

I try kpartx and it's so cool, but I can't make snapshots of 
/dev/vg00/lv00p1 ... so I can't solve the problem of making backup 
without stopping the Virtual Machine.

Any advice?

Regards,

Marc


Bryn M. Reeves wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> 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.
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.7 (GNU/Linux)
> Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org
>
> iD8DBQFHA1w96YSQoMYUY94RAhW3AKC9n8+5tzN/FW38+qIUj0a82vvAMQCg0qYb
> bAWnKGAuyZnMoZZz089I2qg=
> =+xgZ
> -----END PGP SIGNATURE-----
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>