[sheepdog-users] [sheepdog users] cluster snapshot VS qemu-img
terletskiy at emu.ru
Mon Aug 18 13:08:37 CEST 2014
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
> 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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