[Users] How to backup thin provisioned qcow2 disks?

Allon Mureinik amureini at redhat.com
Wed Dec 4 14:57:50 UTC 2013

----- Original Message -----

> From: "Ernest Beinrohr" <Ernest.Beinrohr at axonpro.sk>
> To: "users" <users at ovirt.org>
> Sent: Monday, November 25, 2013 12:20:08 PM
> Subject: [Users] How to backup thin provisioned qcow2 disks?

> Hi, I'm currently looking for ways to backup my disks.
> Live storage migration converted my disks from
> preallocated to thin provisioning. Preallocated disk
> backups are working from a simple dd from a snapshot,
> but the thin qcow2 disks are a problem. I seems it uses
> multiple logical volumes (3 in my case).
For one snapshot? Are you sure? 

> Also they
> are combined MUCH bigger than the preallocated:
> 8GB raw vs thin: 31 GB - 1 snapshot.
What version are you using? 
And on what storage? 

> So I have two questions:
> - how would you backup these thin disks?
You could just copy all three of your volumes. 
A more robust way, though, would probably be to export the disk to an export domain. 

> - is it possible to convert thin to preallocated and
> discard the snapshots
Unfortunately, not while the VM is still running. If you shut it down, you can merge the snapshot back. 
Go to VMs -> Snapshots -> select the snapshot you want to remove, and click delete. 

> thanks

> --
> Ernest Beinrohr, AXON PRO
> DevOps, Ing , RHCE , RHCVA , LPIC , VCA , +421-2--6241-0360 ,
> +421-903--482-603
> icq:28153343, skype:oernii-work , jabber:oernii at jabber.org

> “For a successful technology, reality must take precedence over public
> relations, for Nature cannot be fooled.” Richard Feynman

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