On 06/19/15 13:23, Erik Logtenberg wrote: > I believe this may be the same issue I reported some time ago, which is > as of yet unsolved. > > https://www.mail-archive.com/ceph-users@xxxxxxxxxxxxxx/msg19770.html > > I used strace to figure out that the OSD's were doing an incredible > amount of getxattr, setxattr and removexattr calls, for no apparent > reason. Do you see the same write pattern? > > My OSD's are also btrfs-backed. Thanks for the heads-up. Did you witness this with no activity at all? >From your report, this was happening during CephFS reads and we don't use CephFS, only RBD volumes. The amount of written data in our case is fairly consistent too. I'll try to launch a strace but I'm not sure if I will have the time before we add SSDs to our currrent HDD-only setup. If I can strace btrfs OSD without SSD journals I'll report here. Lionel _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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