We just had a fairly extensive discussion about this on the thread "running Qemu / Hypervisor AND Ceph on the same nodes". Check that out in the archives.
On Fri, Apr 3, 2015 at 6:08 AM, Piotr Wachowicz < piotr.wachow...@brightcomputing.com> wrote: > > Hey, > > We keep hearing that running Hypervisors (KVM) on the OSD nodes is a bad idea. But why exactly is that the case? > > In our usecase, under normal operations our VMs use relatively low amounts of CPU resources. So are the OSD services, so why not combine them? (We use ceph for openstack volume/images storage, 7 shared OSD/KVM nodes, 2 pools, 128 PGs per pool, 2 OSDs per node, 10GigE) > > I know that during recovery the OSD memory usage spikes. So I guess that might be one of the reasons. > > But are there any other concrete examples of situations when the hypervisor could compete for CPU/mem resources with the OSD services running on the same node in a way which would noticeably impact the performance of either? > > Kind Regards, > Piotr > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
