Hi!In my ongoing quest to wrap my head around Ceph, I created a CephFS (data and metadata pool with replicated size 3, 128 pgs each). When I mount it on my test client, I see a usable space of ~500 GB, which I guess is okay for the raw capacity of 1.6 TiB I have in my OSDs.
I run bonnie with -s 0G -n 20480:1k:1:8192i.e. I should end up with ~20 million files, each file 1k in size maximum. After about 8 million files (about 4.7 GBytes of actual use), my cluster runs out of space.
Is there something like a "block size" in CephFS? I've read http://docs.ceph.com/docs/master/cephfs/file-layouts/ and thought maybe object_size is something I can tune, but I only get $ setfattr -n ceph.dir.layout.object_size -v 524288 bonnie setfattr: bonnie: Invalid argumentIs this even the right approach? Or are "CephFS" and "many small files" such opposing concepts that it is simply not worth the effort?
-- Jörn Clausen Daten- und Rechenzentrum GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel Düsternbrookerweg 20 24105 Kiel
Attachment:
smime.p7s
Description: S/MIME Cryptographic Signature
_______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
