Hi Simon, Did you check iostat on the OSDs to check their utilization? What does your ceph -w say - pehaps you’re maxing your cluster’s IOPS? Also, are you running any monitoring of your VMs iostats? We’ve often found some culprits overusing IOs..
Kind Regards, David Majchrzak 12 jun 2014 kl. 15:22 skrev Xu (Simon) Chen <[email protected]>: > Hi folks, > > We have two similar ceph deployments, but one of them is having trouble: VMs > running with ceph-provided block devices are seeing frequent high io wait, > every a few minutes, usually 15-20%, but as high as 60-70%. This is > cluster-wide and not correlated with VM's IO load. We turned on rbd cache and > enabled writeback in qemu, but the problem persists. No-deepscrub doesn't > help either. > > Without providing any one of our probably wrong theories, any ideas on how to > troubleshoot? > > Thanks. > -Simon > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
