I have the following setup: Node1 = 8 x SSD Node2 = 6 x SATA Node3 = 6 x SATA Client1 All Cisco UCS running RHEL6.5 + kernel 3.18.0 + ceph 0.88. A "dd bs=4k oflag=direct" test directly on a OSD disk shows me: Node1 = 60MB/s Node2 = 30MB/s Node2 = 30MB/s I've created 2 pools, each size=1, pg_num=1024. I've created a rbd image, formatted it ext4 (bs=4k), but also xfs. A "dd bs=4k oflag=direct" test on that image shows me 5 MB/s. A "dd bs=4M oflag=direct" test on that image shows me 150 MB/s. A "dd bs=32M oflag=direct" test on that image shows me 260 MB/s. A "rados bench write" test on that pool shows me 560 MB/s. What am i doing wrong? Why is a 4kb block size write so slow? Thanks for any help... Samuel Terburg _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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