[Luminous 12.2.2] Cluster peformance drops after certain point of time

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi All,
I am testing luminous 12.2.2 and find a strange behavior of my cluster.
       I was testing my cluster throughput by using fio on a mounted rbd with follow fio parameters:
           fio -directory=fiotest -direct=1 -thread -rw=write -ioengine=libaio -size=200G -group_reporting -bs=1m -iodepth 4 -numjobs=200 -name=writetest
       Everything was fine at the begining, but after about 10 hrs of testing I found the performance dropped noticeably.
       Throughput droped from 300-450MBps to 250-350MBps  and osd latency increased from 300ms to 400ms
       I also noted the heap stats showed the osd start reclaiming  page heap freelist much more frequently but the rss memory of osd were increasing.
      
      below is the links of grafana graph of my cluster.
      cluster metrics: https://pasteboard.co/GYEOgV1.jpg
      osd mem metrics: https://pasteboard.co/GYEP74M.png
      In the graph the performance dropped after 10:00.
 
     I am investigating what happened but haven't found any clue yet. If you know any thing about how to solve this problem or where I should  look into please let me know. 
     Thanks. 
 
 
2017-12-18

lin.yunfan
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com

[Index of Archives]     [Information on CEPH]     [Linux Filesystem Development]     [Ceph Development]     [Ceph Large]     [Ceph Dev]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [xfs]


  Powered by Linux