[PVE-User] Backup in snapshot mode with running sortware

Gilberto Nunes gilberto.nunes32 at gmail.com
Mon Jul 28 20:22:54 CEST 2014


In other words, nothing to be so concerned, at all...


2014-07-28 15:08 GMT-03:00 Adam Thompson <athompso at athompso.net>:

> You'll get what's called "crash-consistent", which means the filesystem
> and database both have to do a consistency check and replay or rollback
> their journals.
> This *usually* works automatically, but many things can cause problems.
> Remember that restoring a snapshot is almost exactly equivalent to pulling
> the plug on a server and then rebooting it (minus the risk of writing
> corrupt data during the handful of milliseconds the system keeps running
> with insufficient power)... In other words, if you kill -9'd the KVM
> process and restarted it, you'd be in exactly the same situation as when
> restoring a snapshot.
> So if your software stack usually handles that kind of failure, it'll also
> usually handle snapshots properly. Most systems & software do, nowadays,
> including ext3 and MySQL.
> -Adam
>
> On July 28, 2014 12:56:45 PM CDT, "Luis G. Coralle" <
> luiscoralle at fi.uncoma.edu.ar> wrote:
>
>> Hi all
>>
>> I have a question regarding backups.
>> Assuming a traditional installation of 3.2 pve a linux vm with qcow2,
>> saved on disk /dev/mapper/pve-data on /var/lib/vz type ext3
>> Assuming I have mysql running on the VM with a large DB. What happens
>> when a backup is made in snapshot mode of the vm?
>> When the backup is restored, the DB is in a consistent state?
>>
>>
>> --
>> Luis G. Coralle
>>
>> ------------------------------
>>
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>>
>>
> --
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
>
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-- 
Obrigado

Cordialmente

Gilberto Ferreira


Konnecta TI Tecnologia - Sistemas de Virtualização, Soluções de
Armazenamento de Dados, Criação de SAN/NAS, Zimbra Mail Server, Implantação
de Linux e Windows server.

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