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

Valerio Pachera sirio81 at gmail.com
Mon Aug 18 11:55:23 CEST 2014

2014-08-18 11:11 GMT+02:00 Liu Yuan <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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