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
