Ceph has per-pg and per-OSD metadata overhead. You currently have 26000 PGs, suitable for use on a cluster of the order of 260 OSDs. You have placed almost 7GB of data into it (21GB replicated) and have about 7GB of additional overhead.
You might try putting a suitable amount of data into the cluster before worrying about the ratio of space used to data stored. :) -Greg On Fri, Mar 27, 2015 at 3:26 AM Saverio Proto <ziopr...@gmail.com> wrote: > > I will start now to push a lot of data into the cluster to see if the > > "metadata" grows a lot or stays costant. > > > > There is a way to clean up old metadata ? > > I pushed a lot of more data to the cluster. Then I lead the cluster > sleep for the night. > > This morning I find this values: > > 6841 MB data > 25814 MB used > > that is a bit more of 1 to 3. > > It looks like the extra space is in these folders (for N from 1 to 36): > > /var/lib/ceph/osd/ceph-N/current/meta/ > > This "meta" folders have a lot of data in it. I would really be happy > to have pointers to understand what is in there and how to clean that > up eventually. > > The problem is that googling for "ceph meta" or "ceph metadata" will > produce results for Ceph MDS that is completely unrelated :( > > thanks > > Saverio >
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