Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
> Hi, > > On 15.04.2012 22:05, Björn Enroth wrote: > > I am looking for information of how to deal with a KVM three node cluster > > with DRBD > > I have a "baby machine" ubuntu 11.10 pacemaker/drbd cluster with two > > nodes, local disks with drbd setup in between. This is working flawless. > > > > My challenge now is that I want to add a third node with the same setup. > > How do I handle drbd in this setup? I'd like to have all nodes active, to > > be able to migrate resources, mainly kvm virtual guests, around the > > cluster as I see fit. I'd also like pacemaker to be able to dynamically > > handle the load. > > While drbd is great, this is exactly our intended use-case and also > exactly the reason I am looking at other storage solutions. drbd can't > do more than two nodes. > > You can of course distribute the drbd-resources so that some are n1/n2, > some n2/n3 and some n1/n3, but that becomes an administrators nightmare. > And once you decide that you need four nodes with the data present on at > least three nodes, you are stuck. > You can layer the drbd-resources but that is more meant for semi-distant > mirrors and manual fail-over. > And if you want live-migrations for your vms with more then two primary > filesystem nodes... > > I am currently looking at glusterfs, there is also moosefs and ceph(fs), > but only the first is meant to be stable enough that redhat gives > commercial support for it. There are also other distributed cluster > filesystems like lustre, but they lack redundancy. Hi, Basically DRBD only works with two nodes. You can add a third one in a stacked setup. But I don't know if an active/active setup is possible. Better think about using your two-node DRBD as a iSCSI portal for the virtual machines. Your can set this up with three nodes making the virtual machines free moveable between all nodes in the cluster. Greetings, -- Dr. Michael Schwartzkopff Guardinistr. 63 81375 München Tel: (0163) 172 50 98 Fax: (089) 620 304 13 -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 198 bytes Desc: This is a digitally signed message part. URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20120417/dbb5a8ef/attachment.pgp>