On 9/26/2011 3:54 PM, Tobias Schenk wrote:
> Am 26.09.2011 20:33, schrieb Josh Fisher:
>> On 9/20/2011 5:40 AM, Adrian Reyer wrote:
>>> On Sun, Sep 18, 2011 at 05:47:34PM +0200, Tobias Schenk wrote:
>>>> I try use bacula 5.0.3 on suse linux to backup lvm snapshots.
>>>> I cannot simply mount /dev/dm-6 to somewhere because the contents is a
>>>> partitioned raw device of a kvm instance.
>>> You could check the path with something like 'ls -l'.
>>> On the other hand, you could use 'kpartx' and make the snapshots
>>> partitions actually mountable if you 'speak' the used filesystem. The
>>> benefit would be you only backup teh changed files in an incremental
>>> backup instead of having to save the whole image even with one byte
>>> changed.
>>> In my installations I ahd always been able to just run a baclua-fd
>>> inside the KVM, though.
>> Yes, running bacula-fd in the VM should certainly be considered. It
>> offers several advantages. For one thing, it is far simpler to restore a
>> file to a running VM. In my case, the VMs run in a Pacemaker cluster
>> with LVs on DRBD storage, so trying to backup LVM snapshots on the node
>> that the VM happens to be running on was far more complex than just
>> running bacula-fd in the VMs
> I agree to your argument in general. My VMs have minimum two virtual
> disks. One containig the 'system' which rarely changes and others
> containing the 'data' like webserver spaces, DMS and so on. For the
> latter I use bacula-fd.
> But for the 'system' I like to use the lvm snapshots. It appears to me
> that I can move the whole vm construct much more quickly around and
> always get a bootable vm system without bootstraps or whatever. I do
> this on amateur scale for a small at-home solution.
> If I accidently destroy the 'system' like rm -r *, which embarassingly
> already happened, I can just restore the snapshot, run the vm and
> restore the data. I figure I would have some more steps to do to restore
> a vm otherwise. But maybe that is just my ignorance.

We do nearly the same thing. Since all of my VMs are identical Centos 6 
systems except for data, I use a single disk image for all VMs, rather 
than individual LVM snapshots for each VM. Same concept.


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