[librbd] Add interface of get the snapshot size?
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! -- Best Regards, Wheat -- To unsubscribe from this list: send the line unsubscribe ceph-devel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [librbd] Add interface of get the snapshot size?
On 03/24/2014 02:30 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. What do you mean with space usage? Cluster wide or pool usage? 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! -- Wido den Hollander 42on B.V. Phone: +31 (0)20 700 9902 Skype: contact42on -- To unsubscribe from this list: send the line unsubscribe ceph-devel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [librbd] Add interface of get the snapshot size?
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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
