Hi John, Thanks for the responses.
For (a), I remember reading somewhere that one can only run a max of 1 monitor/node, I assume that that implies the single monitor process will be responsible for ALL ceph clusters on that node, correct? So (b) isn't really a Ceph issue, that's nice to know. Any recommendations on the minimum kernel/glibc version and min RAM size requirements where Ceph can be run on a single client in native mode? Reason I ask this is in a few deployment scenarios (especially non-standard like telco platforms), hardware gets added gradually, so its more important to be able to scale the cluster out gracefully. I actually see Ceph as an alternative to SAN, using JBODs from machines to create a larg(ish) storage cluster. Plus, usually, the clients would probably be running on the same hardware as the OSD/MON, because space on the chassis is at a premium. (d) I was thinking about single node failure scenarios, with 3 nodes, wouldn't a failure of 1 node cause PAXOS to not work? Thanks, Hari On Fri, Jul 26, 2013 at 10:00 AM, John Wilkins <john.wilk...@inktank.com>wrote: > (a) Yes. See > http://ceph.com/docs/master/rados/configuration/ceph-conf/#running-multiple-clusters > and > http://ceph.com/docs/master/rados/deployment/ceph-deploy-new/#naming-a-cluster > (b) Yes. See > http://wiki.ceph.com/03FAQs/01General_FAQ#How_Can_I_Give_Ceph_a_Try.3F > Mounting kernel modules on the same node as Ceph Daemons can cause > older kernels to deadlock. > (c) Someone else can probably answer that better than me. > (d) At least three. Paxos requires a simple majority, so 2 out of 3 is > sufficient. See > http://ceph.com/docs/master/rados/configuration/mon-config-ref/#background > particularly the monitor quorum section. > > On Wed, Jul 24, 2013 at 4:03 PM, Hariharan Thantry <than...@gmail.com> > wrote: > > Hi folks, > > > > Some very basic questions. > > > > (a) Can I be running more than 1 ceph cluster on the same node (assume > that > > I have no more than 1 monitor/node, but storage is contributed by one > node > > into more than 1 cluster) > > (b) Are there any issues with running Ceph clients on the same node as > the > > other Ceph storage cluster entities (OSD/MON?) > > (c) Is the best way to access Ceph storage cluster in native mode by > > multiple clients through hosting a shared-disk filesystem on top of the > RBD > > (like OCFS2?). What if these clients were running inside VMs? Could one > then > > create independent partitions on top of rbd and give a partition to each > of > > the VMs? > > (d) Isn't the realistic minimum for # of monitors in a cluster at least 4 > > (to guard against one failure?) > > > > > > Thanks, > > Hari > > > > > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > -- > John Wilkins > Senior Technical Writer > Intank > john.wilk...@inktank.com > (415) 425-9599 > http://inktank.com >
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