[sheepdog-users] [sheepdog users] cluster snapshot VS qemu-img

[Maxim Terletskiy]

Can you tell more about selective vdi restore?

18.08.2014 13:55, Valerio Pachera ?????:
>
>
>
> 2014-08-18 11:11 GMT+02:00 Liu Yuan <namei.unix at gmail.com 
> <mailto:namei.unix at gmail.com>>:
>
>     > Restore: 6'01''
>
>     We use only at most nr_of_nodes * 2 threads for snapshot save,
>     considering not
>     draining the cluster too much.
>
> Ok clear.
>
>     I guess qemu-img use more threads and it doesn't calculating the
>     fingerprint
>     to de-duplicate.
>
>
> Repeating for the second time 'cluster snapshot save' with '-m' 
> option, it takes 3'37''.
> I guess because fingerprints were already calculated.
>
> Import is also a bit slower:
> 5'05'' for 'cluster snaphsot load -m'
> 3'43'' for qemu-img.
>
> In case of selective vdi restore it's fine like that, to avoid 
> stealing too much resources as you say.
>
>

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