Hi,
just some comments:
CephFS has an overhead for accessing files (capabilities round trip to
MDS for first access, cap cache management, limited number of concurrent
caps depending on MDS cache size...), so using the cephfs filesystem as
storage for a filestore OSD will add some extra overhead. I would use a
loopback file since it reduces the cephfs overhead (one file, one cap),
but it might also introduce other restrictions, e.g. fixed size of the file.
If you can use a ceph cluster as 'backend storage', you can also use a
rbd image. This should be remove most of the restrictions you have
already mentioned (except fixed size again). You can also use multiple
images to have multiple OSDs ;-)
Regards,
Burkhard
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