For a high perf cluster - absolutely agree ... but I would suggest that running the MONs as VMs has it's on performance challenges, to carefully manage as well. If you are on oversubscribed hypervisors, you may end up with the same exact issues with perf impacting the MONs. For a very small non high perf cluster - and a careful eye over perf impact on the OSD/MON node - I don't think it's an issue. But pushing the performance levels on the cluster - absolutely agree that MON should be completely separated. On 6/25/15, 11:34 PM, "ceph-users on behalf of Wido den Hollander" <ceph-users-bounces@xxxxxxxxxxxxxx on behalf of wido@xxxxxxxx> wrote: >On 06/26/2015 08:23 AM, Alex Gorbachev wrote: >> I would not do this, MONs are very important and any load or stability >> issues on OSD nodes would interfere with the cluster uptime. I found >> it acceptable to run MONs on virtual machines with local storage. But >> since MONs oversee OSD nodes, I believe combining them is a recipe for >> disaster, FWIW. >> > >I fully agree. Technically it COULD work, but I would vote against it. > >Three simple Atom [0] machines with a local SSD will do the job just >fine for most smaller Ceph cluster. > >Wido _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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