how to restore a snapshot in XFS ?

how to restore a snapshot in XFS ?

[Bernd Lentes]

Hi,

I just created a XFS Partition to store raw images of qemu domains on it.
I create snapshots of these files with cp --reflink.
Is that the correct way ?

Now I want to go back to such a snapshot. How do I achieve this ?
Just copy the snapshot over the original ?

Thanks.

Bernd


--

Bernd Lentes
SystemAdministrator
Institute of Metabolism and Cell Death
Helmholtz Zentrum München
Building 25 office 122
Bernd.lentes@helmholtz-munich.de
+49 89 3187 1241

Helmholtz Zentrum München – Deutsches Forschungszentrum für Gesundheit und Umwelt (GmbH)
Ingolstädter Landstraße 1, D-85764 Neuherberg, https://www.helmholtz-munich.de
Geschäftsführung: Prof. Dr. med. Dr. h.c. Matthias H. Tschöp, Dr. Michael Frieser | Aufsichtsratsvorsitzende: MinDir’in Prof. Dr. Veronika von Messling
Registergericht: Amtsgericht München HRB 6466 | USt-IdNr. DE 129521671

Re: how to restore a snapshot in XFS ?

[Alexander Puchmayr]

On Sonntag, 12. Mai 2024, 14:30:12 CEST Bernd Lentes wrote:
> Hi,
> 
> I just created a XFS Partition to store raw images of qemu domains on it.
> I create snapshots of these files with cp --reflink.
> Is that the correct way ?
> 
> Now I want to go back to such a snapshot. How do I achieve this ?
> Just copy the snapshot over the original ?
> 
I'm following this strategy for several years now, in in case I need to 
restore from such a "backup", I use cp --reflink when copying the snapshot over 
the original. 
Without the --reflink you'd get a completely new copy of your snapshot, and 
when producing new snapshots they will not have anything in common with your 
previous snapshots --> more disc space. 

Alex



> Thanks.
> 
> Bernd
> 
> 
> --
> 
> Bernd Lentes
> SystemAdministrator
> Institute of Metabolism and Cell Death
> Helmholtz Zentrum München
> Building 25 office 122
> Bernd.lentes@helmholtz-munich.de
> +49 89 3187 1241
> 
> Helmholtz Zentrum München – Deutsches Forschungszentrum für Gesundheit und
> Umwelt (GmbH)
 Ingolstädter Landstraße 1, D-85764 Neuherberg,
> https://www.helmholtz-munich.de Geschäftsführung: Prof. Dr. med. Dr. h.c.
> Matthias H. Tschöp, Dr. Michael Frieser | Aufsichtsratsvorsitzende:
> MinDir’in Prof. Dr. Veronika von Messling Registergericht: Amtsgericht
> München HRB 6466 | USt-IdNr. DE 129521671