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

[Liu Yuan]

On Mon, Aug 18, 2014 at 11:55:23AM +0200, Valerio Pachera wrote:
> 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'

For now, '-m' can only apply to 'snapshot save'. 'snapshot load' is always
mutlithreaded.

Thanks
Yuan