[sheepdog] [PATCH 1/4] dog: make consistency check optional

[Liu Yuan]

On Thu, Aug 22, 2013 at 01:01:40PM +0900, MORITA Kazutaka wrote:
> From: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
> 
> This splits vdi check into replica existence check and replica
> consistency check, and make consistency check optional.  It is because:
> 
>  - Existence check can be done even when there is a VM who uses the
>    vdi.
> 
>  - Existence check doesn't need to calculate sha1 values and it is
>    much faster than consistency check.
> 
>  - Existence check is more important because write requests are
>    rejected when one of the replicas is missing.
> 
>  - In most cases, replica inconsistency doesn't cause a problem
>    because the client should have received EIO when the consistency
>    problem happened and the client shouldn't use the inconsistent area
>    without updating the area again.

Make existence check default looks okay to me, but then can we fix not_found
object by 'vdi check' without -C?

Thanks
Yuan