Re: [Xen-users] Backup domU image at runtime

["Fajar A. Nugraha" <list@xxxxxxxxx>]

On Fri, Mar 9, 2012 at 10:30 PM, Javier Guerra Giraldez
<javier@xxxxxxxxxxx> wrote:
> On Fri, Mar 9, 2012 at 10:05 AM, Fajar A. Nugraha <list@xxxxxxxxx> wrote:
>>> anyone already experienced with btrfs and its snapshots ?
>>>
>>> (performance / stability) ?
>>
>>
>> Is this a trick question? :D
>
> also, btrfs is _not_ a cluster filesystem, so i would be very
> (pleasantly) surprised if you could mount a snapshot on a different
> machine from the one that 'owns' the main filesystem.
>
> so, it would only facilitate 'from inside' backups, no advantage for
> 'from outside' access.

Not necessarily. Phillppe MIGHT want the following scenarios:
- all domU's disk image are stored as files
- the files are stored on a btrfs fs on dom0
- backups will be done by copying domU's disk image

In that case btrfs' snapshot can replace LVM's snapshot, with the
additional benefit that you don't have to worry about the snapshot LV
being full.

Also, if you implement some continious snapshot mechanism (like
snapper), you could actually roll-back a domU's disk to a certain
point-in-time in past. Very useful if (for example) a user accidently
delete an important file, realize it immediately, and want it back.

-- 
Fajar

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