Graham, The before/after FIO tests sound interesting, we’re trying to pull together some benchmark tests to do the same for our Ceph cluster. Could you expand on which parameters you used, and how the file size relates to the RAM available to your VM? Regards, Paul Ashman _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com