[sheepdog] vdi object journaling and atomic write

[Liu Yuan]

On 08/31/2012 03:30 PM, MORITA Kazutaka wrote:
> At Fri, 31 Aug 2012 15:24:21 +0800,
> Liu Yuan wrote:
>>
>> From the trace we can see that journaling is most time consuming process for
>> VDI object write, account almost for 70% (with 3 copies, all 3 nodes on the same box).
>>
>> Because we support all or nothing atomic write, do we still need to suppose VDI object
>> journeling?
> 
> Do you mean store->atomic_put?  It doesn't support partial write.
> 

Yes. What do you mean by partial write? partial write will be stored as
oid.tmp, which can be removed when sheep start up, then it won't cause
trouble, no?

Thanks,
Yuan