[sheepdog-users] Concern about sheepdog performance

Jan Dvořák mordae at anilinux.org
Tue Dec 18 04:11:54 CET 2012

> On 12/18/2012 12:40 AM, Jan Dvořák wrote:
> > we have managed to get pretty good performance with disabled caches and
> > directio everywhere. That means cache=none for kvm and -D for sheepdog.
> > I haven't tested current version.
> Interesting, which version did you use and what did you do to get a
> 'pretty good' performance with no caches and diretio?

I think about 3 months back and we managed to get dio dd write from VM/virtio at 30M/s with 3 copies on 3 machines over 1Gbps line and data on ext4.

That appeared to hit the line bottleneck so we have been satisfied. Recovery of lost nodes we tested with a similar setup was painfully slow, however.

Take this with a grain of salt, it's been too long.

Best regards,
    Jan Dvorak

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