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From ceph-users archive 08/27/2013: On 08/27/2013 01:39 PM, Timofey Koolin wrote: > Is way to know real size of rbd image and rbd snapshots? > rbd ls -l write declared size of image, but I want to know real size. You can sum the sizes of the extents reported by: rbd diff pool/image[@snap] [--format json] That's the difference since the beginning of time, so it reports all used extents. Josh I don’t seem to be able to find any documentation supporting the [@snap] parameter for this call, but it seems to work, at least in part. I have a requirement to find the size of a snapshot relative to another snapshot. Here is what I’ve
used: rbd diff pool/image@snap2 --from-snap snap1 The returned list of extents seems to include all changes since snap1, not just those up to snap2, but those that have been written after snap2 are labeled “zero” rather than as “data” extents. If I ignore the “zero” extents and sum the
lengths of the “data” extents, it seems to give me an accurate relative snapshot size. Is this expected behavior and the correct way to calculate the size I’m looking for? Thanks in advance. Steve |
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