When starting an OSD in a Docker container (so the volume is btrfs), we see the following output:
2015-01-24 16:48:30.511813 7f9f3d066900 0 ceph version 0.87 (c51c8f9d80fa4e0168aa52685b8de40e42758578), process ceph-osd, pid 1 2015-01-24 16:48:30.522509 7f9f3d066900 0 filestore(/var/lib/ceph/osd/ceph-0) backend btrfs (magic 0x9123683e) 2015-01-24 16:48:30.535455 7f9f3d066900 0 genericfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_features: FIEMAP ioctl is supported and appears to work 2015-01-24 16:48:30.535519 7f9f3d066900 0 genericfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_features: FIEMAP ioctl is disabled via 'filestore fiemap' config option 2015-01-24 16:48:30.628612 7f9f3d066900 0 genericfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_features: syncfs(2) syscall fully supported (by glibc and kernel) 2015-01-24 16:48:30.628960 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: CLONE_RANGE ioctl is supported 2015-01-24 16:48:30.629211 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: failed to create simple subvolume test_subvol: (17) File exists 2015-01-24 16:48:30.629509 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: SNAP_CREATE is supported 2015-01-24 16:48:30.630487 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: SNAP_DESTROY failed: (1) Operation not permitted 2015-01-24 16:48:30.630763 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: snaps enabled, but no SNAP_DESTROY ioctl; DISABLING 2015-01-24 16:48:30.631744 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: START_SYNC is supported (transid 67) 2015-01-24 16:48:30.639763 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: WAIT_SYNC is supported 2015-01-24 16:48:30.639914 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: removing old async_snap_test 2015-01-24 16:48:30.640178 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: failed to remove old async_snap_test: (1) Operation not permitted 2015-01-24 16:48:30.641138 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: SNAP_CREATE_V2 is supported 2015-01-24 16:48:30.641387 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: SNAP_DESTROY failed: (1) Operation not permitted 2015-01-24 16:48:30.641528 7f9f3d066900 0 btrfsfilestorebackend(/var/lib/ceph/osd/ceph-0) detect_feature: failed to remove test_subvol: (1) Operation not permitted 2015-01-24 16:48:30.651029 7f9f3d066900 0 filestore(/var/lib/ceph/osd/ceph-0) mount: enabling WRITEAHEAD journal mode: checkpoint is not enabled 2015-01-24 16:48:30.651282 7f9f3d066900 -1 journal FileJournal::_open: disabling aio for non-block journal. Use journal_force_aio to force use of aio anyway 2015-01-24 16:48:30.652322 7f9f3d066900 1 journal _open /var/lib/ceph/osd/ceph-0/journal fd 19: 5368709120 bytes, block size 4096 bytes, directio = 1, aio = 0 2015-01-24 16:48:30.652945 7f9f3d066900 1 journal _open /var/lib/ceph/osd/ceph-0/journal fd 19: 5368709120 bytes, block size 4096 bytes, directio = 1, aio = 0 2015-01-24 16:48:30.654462 7f9f3d066900 1 journal close /var/lib/ceph/osd/ceph-0/journal We're considering disabling copy-on-write for the directory to improve write performance. Are there any recommendations for or against this? Thanks! Chris
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