On 02/06/2014 04:17 AM, Christian Kauhaus wrote:
Hi, after running Ceph for a while I see a lot of fragmented files on our OSD filesystems (all running ext4). For example: itchy ~ # fsck -f /srv/ceph/osd/ceph-5 fsck von util-linux 2.22.2 e2fsck 1.42 (29-Nov-2011) [...] /dev/mapper/vgosd00-ceph--osd00: 461903/418119680 files (33.7% non-contiguous), 478239460/836229120 blocks This is an unusually high value for ext4. The normal expectation is something in the 5% range. I suspect that such a high fragmentation produces lots of unnecessary seeks on the disks. Has anyone an idea what to do to make Ceph fragment an OSD filesystem less?
Hi Christian, can you tell me a little bit about how you are using Ceph and what kind of IO you are doing?
TIA Christian
_______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
