[sheepdog-users] Concern about sheepdog performance
morita.kazutaka at lab.ntt.co.jp
Tue Dec 18 04:43:13 CET 2012
At Tue, 18 Dec 2012 11:21:31 +0800,
Liu Yuan wrote:
> On 12/18/2012 11:11 AM, Jan Dvořák wrote:
> > 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.
> Recovery is slow because we don't want recovery process saturate the
> network. Serving in-flight IO during recovery is preferred over
> recovery. I think with this strategy, VMs will feel more smooth disk IO
> during recovery process. Also, there is always conflict between data
> balance and minimal data migration. We prefer data balance, so this
> preference will result in more data migration than necessary.
I think it would be a good idea to add support for multiple NICs and
use a dedicated NIC for object recovery. Then, we don't have to worry
about network saturation caused by recovery.
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