Hi Brock- Do you mean 7 cmds's or cmon's? Multiple cmons help with durability, but that's it--they're only used for cluster configuration state (and I wouldn't really recommend more than 3 unless you have a really huge cluster). And I wouldn't use more than one cmds until you see it saturating your CPU.
In general, metadata writes/updates will be slower than a local fs, similar in performance to NFS. Most reads will be faster due to the coherent cache and metadata prefetching. I did see a slowdown when btrfs is used on the OSDs that I haven't looked into yet... sage On Mon, 11 Aug 2008, Erwin, Brock A wrote: > I am running fileop, a program within iozone that tests file operation > performance. I also set ceph up with 7 monitors and 1 osd, to see if I > could get a fileop performance increase. However, it seems that do > operations like stat, access, open, create, mkdir, etc. are much slower > than when I run the test on the local file system. I noticed each of > the monitors had about 30% cpu utilization or so. Where is the > bottleneck in this case? Can this performance be increased? > > -Brock > > P.S. I compiled ceph with O2 optimizations and disabled all debugging > output. > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Ceph-devel mailing list > Ceph-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/ceph-devel > > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Ceph-devel mailing list Ceph-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ceph-devel
