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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