Hi Greg, It's the write benchmark..
Regards Khanh From: Gregory Farnum [mailto:g...@inktank.com] Sent: Thursday, May 23, 2013 10:56 AM To: Khanh. Nguyen Dang Quoc Cc: ceph-users@lists.ceph.com Subject: Re: [ceph-users] performance degradation issue What's the benchmark? -Greg On Wednesday, May 22, 2013, Khanh. Nguyen Dang Quoc wrote: Dear all, now i faced one issue in ceph block device: performance degradation ceph version 0.61.2 (fea782543a844bb277ae94d3391788b76c5bee60) ceph status health HEALTH_OK monmap e1: 2 mons at {a=49.213.67.204:6789/0,b=49.213.67.203:6789/0<http://49.213.67.204:6789/0,b=49.213.67.203:6789/0>}, election epoch 20, quorum 0,1 a,b osdmap e53: 2 osds: 2 up, 2 in pgmap v535: 576 pgs: 576 active+clean; 11086 MB data, 22350 MB used, 4437 GB / 4459 GB avail mdsmap e29: 1/1/1 up {0=a=up:active}, 1 up:standby I do benchmark with one osd, I receive the io speed is about 190MB/s But When i add more osd, replicate size =2 , the write performance degradated is about 90MB/s Follow the pratice, the write performance must be increated as adding more osd but I can't receive that. :( anyone can you help me check what's wrong in config file or anything else? Regards, Khanh Nguyen -- Software Engineer #42 @ http://inktank.com | http://ceph.com
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