Perhaps unbelanced OSDs? Could you send us an osd tree Output? - Mehmet
Am 24. März 2018 19:46:44 MEZ schrieb "da...@visions.se" <da...@visions.se>: >You have 2 drives at almost 100% util which means they are maxed. So >you need more disks or better drives to fix your io issues (SSDs for >MySQL is a no brainer really) >------ Ursprungligt meddelande------Från: Sam HuracanDatum: lör 24 mars >2018 19:20Till: c...@elchaka.de;Kopia: >ceph-users@lists.ceph.com;Ämne:Re: [ceph-users] Fwd: High IOWait Issue >This is from iostat: >I'm using Ceph jewel, has no HW error.Ceph health OK, we've just use >50% total volume. > > >2018-03-24 22:20 GMT+07:00 <c...@elchaka.de>: >I would Check with Tools like atop the utilization of your Disks also. >Perhaps something Related in dmesg or dorthin? > > > >- Mehmet > >Am 24. März 2018 08:17:44 MEZ schrieb Sam Huracan ><nowitzki.sa...@gmail.com>: > >Hi guys,We are running a production OpenStack backend by Ceph. >At present, we are meeting an issue relating to high iowait in VM, in >some MySQL VM, we see sometime IOwait reaches abnormal high peaks >which lead to slow queries increase, despite load is stable (we test >with script simulate real load), you can see in >graph.https://prnt.sc/ivndni > >MySQL VM are place on Ceph HDD Cluster, with 1 SSD journal for 7 HDD. >In this cluster, IOwait on each ceph host is about >20%.https://prnt.sc/ivne08 > >Can you guy help me find the root cause of this issue, and how to >eliminate this high iowait? >Thanks in advance. > > > >_______________________________________________ > >ceph-users mailing list > >ceph-users@lists.ceph.com > >http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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