Hi Wido, Am 26.03.2015 um 11:59 schrieb Wido den Hollander: > On 26-03-15 11:52, Stefan Priebe - Profihost AG wrote: >> Hi, >> >> in the past i rwad pretty often that it's not a good idea to run ceph >> and qemu / the hypervisors on the same nodes. >> >> But why is this a bad idea? You save space and can better use the >> ressources you have in the nodes anyway. >> > > Memory pressure during recovery *might* become a problem. If you make > sure that you don't allocate more then let's say 50% for the guests it > could work.
mhm sure? I've never seen problems like that. Currently i ran each ceph node with 64GB of memory and each hypervisor node with around 512GB to 1TB RAM while having 48 cores. > Using cgroups you could also prevent that the OSDs eat up all memory or CPU. Never seen an OSD doing so crazy things. Stefan > So technically it could work, but memorey and CPU pressure is something > which might give you problems. > >> Stefan >> >> _______________________________________________ >> 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
