[CCing the Pacemaker list here, in case we have people interested in following this discussion there]
On 09/08/2009 05:52 PM, gary.w...@opengi.co.uk wrote: > Hi. I am having a problem whilst carrying out some preliminary > testing of DRBD with OpenAIS. My test setup was all working fine. I > have now introduced it to a simulated wide area network by changing the > subnet on each system, modifying the config files accordingly, adding > the relevant routes and gateway, and using an established Linux box that > we use for throttling bandwidth for such testing. The network config is > sound as I can ping to and from each node through the router system. I > also have full key authentication setup between them. Nothing else has > changed. Gary, If you actually get this to work with OpenAIS, be sure to let us know and share your findings. AFAICS this is bound to fail as OpenAIS currently isn't capable of unicast messaging, so unless you actually manage to get multicast routing set up correctly between your sites, you're out of luck. The Heartbeat communication stack does support unicast, but it too requires that you have super-reliable links between sites. And, regardless of the communication layer beneath it, Pacemaker currently does not support split-site clustering. If you want to do a split-site setup with what is available today, then that effectively amounts to having two separate clusters, which happen to share a DRBD replication link between them. A work-in-progress writeup can be found at http://www.drbd.org/users-guide/s-pacemaker-floating-peers.html -- please be patient; the information is still incomplete. It is set to be completed with the next maintenance release of the User's Guide, which is scheduled for shortly after the DRBD 8.3.3 release. > Now, the DRBD nodes are failing to sync. I am getting no obvious errors. > If I watch the /proc/drbd file, it goes through the motion of syncing, > and the progress bar briefly is seen. It then flips back. Probably just a result of the cluster manager detecting one cluster partition after another, as the underlying communication stack can't see its peer. Cheers, Florian
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