On Mon, Mar 23, 2015 at 6:21 AM, Olivier Bonvalet <ceph.list@xxxxxxxxx> wrote: > Hi, > > I'm still trying to find why there is much more write operations on > filestore since Emperor/Firefly than from Dumpling. Do you have any history around this? It doesn't sound familiar, although I bet it's because of the WBThrottle and flushing changes. > > So, I add monitoring of all perf counters values from OSD. > > From what I see : «filestore.ops» reports an average of 78 operations > per seconds. But, block device monitoring reports an average of 113 > operations per seconds (+45%). > please thoses 2 graphs : > - https://daevel.fr/img/firefly/osd-70.filestore-ops.png > - https://daevel.fr/img/firefly/osd-70.sda-ops.png That's unfortunate but perhaps not surprising — any filestore op can change a backing file (which requires hitting both the file and the inode: potentially two disk seeks), as well as adding entries to the leveldb instance. -Greg > > Do you see what can explain this difference ? (this OSD use XFS) > > Thanks, > Olivier > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
