That makes sense. Thank you! Zhe
From: David Zafman [mailto:david.zaf...@inktank.com] Sent: Wednesday, July 02, 2014 9:46 PM To: Zhe Zhang Cc: ceph-users@lists.ceph.com Subject: Re: [ceph-users] Performance is really bad when I run from vstart.sh By default the vstart.sh setup would put all data below a directory called "dev" in the source tree. In that case you're using a single spindle. The vstart script isn't intended for performance testing. David Zafman Senior Developer http://www.inktank.com http://www.redhat.com On Jul 2, 2014, at 5:48 PM, Zhe Zhang <zhe_zh...@symantec.com<mailto:zhe_zh...@symantec.com>> wrote: Hi folks, I run ceph on a single node which contains 25 hard drives and each @7200 RPM. I write raw data into the array, it achieved 2 GB/s. I presumed the performance of ceph could go beyond 1 GB/s. but when I compile and ceph code and run development mode with vstart.sh, the average throughput is only 200 MB/s for rados bench write. I suspected it was due to the debug mode when I configure the source code, and I disable the gdb with ./configure CFLAGS='-O3' CXXFLAGS='O3' (avoid '-g' flag). But it did not help at all. I switched to the repository, and install ceph with ceph-deploy, the performance achieved 800 MB/s. Since I did not successfully set up the ceph with ceph-deploy, and there are still some pg at "creating+incomplete" state, I guess this could impact the performance. Anyway, could someone give me some suggestions? Why it is so slow when I run from vstart.sh? Best, Zhe _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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