As I understand it:

4.2G is used by ceph (all replication, metadata, et al) it is a sum of
all the space "used" on the osds.
958M is the actual space the data in cephfs is using (without replication).
3.8G means you have some sparse files in cephfs.

'ceph df detail' should return something close to 958MB used for your
cephfs "data" pool. "RAW USED" should be close to 4.2GB

--
Adam

On Sun, Jan 17, 2016 at 9:53 PM, Francois Lafont <flafdiv...@free.fr> wrote:
> On 18/01/2016 04:19, Francois Lafont wrote:
>
>>     ~# du -sh /mnt/cephfs
>>     958M      /mnt/cephfs
>>
>>     ~# df -h /mnt/cephfs/
>>     Filesystem      Size  Used Avail Use% Mounted on
>>     ceph-fuse        55T  4.2G   55T   1% /mnt/cephfs
>
> Even with the option --apparent-size, the size are different (but closer 
> indeed):
>
>     ~# du -sh --apparent-size /mnt/cephfs
>     3.8G        /mnt/cephfs
>
>
> --
> François Lafont
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