Red Hat Bugzilla – Bug 499818
More prominent documentation of cman and split brain.
Last modified: 2012-09-21 08:58:25 EDT
A customer have suggested we make the documentation of the --qpid-cman option and the discussion of handling "split-brain" issues more prominent, since many/most cluster users will need split-brain protection. The custome didn't initially understand the requirement for cman from their initial reading of the doc.
I've added the following text:
For most applications, High Availability Messaging Clusters should be used together with Red Hat Clustering Services (RHCS) to avoid the "split-brain" condition, in which a network failure splits the cluster into two sub-clusters that cannot communicate with each other. See the documentation on the --cluster-cman option for details on running using RHCS with High Availability Messaging Clusters. See the CMAN documentation for more detail on CMAN and split-brain conditions.
I'd make it a bit stronger and add:
Without CMAN, a cluster cannot recover from a split-brain condition. If the network problem is resolved and the sub-clusters start communicating again the results are unpredictable.
Closed as fix already implemented