It's pretty common to see way more writes than reads if you got lots of idle VMs Paul -- Paul Emmerich Looking for help with your Ceph cluster? Contact us at https://croit.io croit GmbH Freseniusstr. 31h 81247 München www.croit.io Tel: +49 89 1896585 90 On Mon, Oct 14, 2019 at 6:34 PM Ingo Schmidt <i.schmidt@langeoog.de> wrote:
Great, this helped a lot. Although "ceph iostat" didn't give iostats of single images, but just general overview of IO, i remembered the new nautilus RDB performance monitoring.
https://ceph.com/rbd/new-in-nautilus-rbd-performance-monitoring/
With a "simple"
rbd perf image iotop i was able to see that the writes indeed are from the Log Server and the Zabbix Monitoring Server. I didn't expect that it would cause that much I/O... unbelieveable...
----- Ursprüngliche Mail ----- Von: "Ashley Merrick" <singapore@amerrick.co.uk> An: "i schmidt" <i.schmidt@langeoog.de> CC: "ceph-users" <ceph-users@ceph.io> Gesendet: Montag, 14. Oktober 2019 15:20:46 Betreff: Re: [ceph-users] Constant write load on 4 node ceph cluster
Is the storage being used for the whole VM disk?
If so have you checked none of your software is writing constant log's? Or something that could continuously write to disk.
If your running a new version you can use : [ https://docs.ceph.com/docs/mimic/mgr/iostat/ | https://docs.ceph.com/docs/mimic/mgr/iostat/ ] to locate the exact RBD image.
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