[pve-devel] Incremental backups

[Eneko Lacunza]

Hi Kamil,

Thanks for the clarification. It's refreshing to see there is a 
technical reason for this and a solution is in the works.

For me, currently the major problem with the patches is that they make 
more difficult to maintain the patched proxmoxes; we have clients that 
can afford the inefficiencies in their use-case otherwise.

Cheers
Eneko

On 19/09/14 11:57, Kamil Trzciński wrote:
> Hi Eneko,
>
> My patches try to add one of missing features, but the way it works is
> not very efficient, because it uses xdelta3 to create differential. It
> not only uses extra CPU cycle, but also requires you to read
> previously done backup. In the future it should be done on qemu level.
> Qemu should track what did exactly change and make incremental backup
> from only changed bits. Similar approach is described here:
> http://wiki.qemu.org/Features/Livebackup
>
> I think that this is completely fine that it's not merged. Just
> because it is an extension which you can install you should also
> understand what drawbacks it has. If it got merged there might be some
> confusion about this feature, because it doesn't work well for large
> number VMs or extremely large ones.
>
> Kamil
>
> On Fri, Sep 19, 2014 at 11:41 AM, Eneko Lacunza <elacunza at binovo.es> wrote:
>> Hi Martin,
>>
>> On 19/09/14 11:07, Martin Maurer wrote:
>>>> I just found out about this blog:
>>>> http://ayufan.eu/projects/proxmox-ve-differential-backups/
>>>>
>>>> You surely know about it; I was curious about the reasons to reject the
>>>> patches
>>>> and also about whether there are any plans for incremental or
>>>> differential
>>>> backups. I think it would be a popular feature with our paying clients.
>>> The reason why this is not included is already discussed on this list.
>>> => read the archives.
>>>
>> If you're pointing to this thread:
>> http://pve.proxmox.com/pipermail/pve-devel/2012-August/thread.html#3412
>>
>> I hardly see any discussion, just a no-statement with a vague "we want to
>> keep vzdump simple" and no reply to Kamil's last message where he points-out
>> that his changes are small. He has even kept the patches up-to-date with
>> Proxmox versions.
>>
>> The feature is very interesting for remote-copying backups and keeping
>> backup storage size lower. I can understand that maybe technical reasons
>> favor another solution against this, but this doesn't seem the case?
>>
>> Eneko
>>
>> --
>> Zuzendari Teknikoa / Director Técnico
>> Binovo IT Human Project, S.L.
>> Telf. 943575997
>>        943493611
>> Astigarraga bidea 2, planta 6 dcha., ofi. 3-2; 20180 Oiartzun (Gipuzkoa)
>> www.binovo.es
>>
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>
>


-- 
Zuzendari Teknikoa / Director Técnico
Binovo IT Human Project, S.L.
Telf. 943575997
       943493611
Astigarraga bidea 2, planta 6 dcha., ofi. 3-2; 20180 Oiartzun (Gipuzkoa)
www.binovo.es