On Sun, Nov 4, 2012 at 10:58 AM, Aleksey Samarin <nrg3...@gmail.com> wrote: > Hi all > > Im planning use ceph for cloud storage. > My test setup is 2 servers connected via infiniband 40Gb, 6x2Tb disks per > node. > Centos 6.2 > Ceph 0.52 from http://ceph.com/rpms/el6/x86_64 > This is my config http://pastebin.com/Pzxafnsm > journal on tmpfs > well, im create bench pool and test it: > ceph osd pool create bench > rados -p bench bench 30 write > > Total time run: 43.258228 > Total writes made: 151 > Write size: 4194304 > Bandwidth (MB/sec): 13.963 > Stddev Bandwidth: 26.307 > Max bandwidth (MB/sec): 128 > Min bandwidth (MB/sec): 0 > Average Latency: 4.48605 > Stddev Latency: 8.17709 > Max latency: 29.7957 > Min latency: 0.039435 > > when i do rados -p bench bench 30 seq > Total time run: 20.626935 > Total reads made: 275 > Read size: 4194304 > Bandwidth (MB/sec): 53.328 > Average Latency: 1.19754 > Max latency: 7.0215 > Min latency: 0.011647 > > I tested the single drive via dd if=/dev/zero of=/mnt/hdd2/testfile > bs=1024k count=20000 > result: 158 MB/sec > > Anyone can tell me why such a weak performance? Maybe I missed something?
Can you run "ceph tell osd \* bench" and report the results? (It'll go to the "central log" which you can keep an eye on if you run "ceph -w" in another terminal.) I think you also didn't create your bench pool correctly; it probably only has 8 PGs which is not going to perform very well with your disk count. Try "ceph pool create bench2 120" and run the benchmark against that pool. The extra number at the end tells it to create 120 placement groups. -Greg -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
