On Thu, 8 Jan 2015 01:35:03 +0000 Garg, Pankaj wrote: > Hi, > I am trying to get a very minimal Ceph cluster up and running (on ARM) > and I'm wondering what is the smallest unit that I can run rados-bench > on ? Documentation at > (http://ceph.com/docs/next/start/quick-ceph-deploy/) seems to refer to 4 > different nodes. Admin Node, Monitor Node and 2 OSD only nodes. > > Can the Admin node be an x86 machine even if the deployment is ARM based? > > Or can the Admin Node and Monitor node co-exist. > > Finally, I'm assuming I can get by with only 1 independent OSD node. > > If that's possible, I can get by with 2 ARM systems only. Can someone > please shed some light on whether this will work? > You can do everything on one node even (need to set replica size to 1).
However that will not realistically reflect reality at all and any benchmarks will be skewed (as always with very small clusters). In addition to that your systems need to be fast enough, meaning CPU for OSD and MON, fast storage for MON(OS) and sufficient RAM to handle everything. Again, learning some things about Ceph is feasible with a minimal cluster, but drawing conclusions about performance with what you have at hand will be tricky. Lastly, Ceph can get very compute intense (OSDs, particularly with small I/Os), so I'm skeptical that ARM will cut the mustard. Christian -- Christian Balzer Network/Systems Engineer [email protected] Global OnLine Japan/Fusion Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
