On 03/24/2014 05:30 PM, Haomai Wang wrote: > Hi all, > > As we know, snapshot is a lightweight resource in librbd and we > doesn't have any statistic informations about it. But it causes some > problems to the cloud management. > > We can't measure the size of snapshot, different snapshot will occur > different space. So we don't have way to estimate the resource usage > of user. > > Maybe we can have a counter to record space usage when volumn created. > When creating snapshot, the counter is freeze and store as the size of > snapshot. New counter will assign to zero for the volume. > > Any feedback is appreciate! > I believe that there is a rough estimation over 'rados df'. Per-image statistics would be awesome, though precise stats will be neither rough too(# of rbd object clones per volume) or introduce new counter mechanism. Dealing with discard for the filestore, it looks even more difficult to calculate right estimation, as with XFS preallocation feature. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
