On Sat, Mar 12, 2011 at 11:19 PM, Parvez Shaikh <[email protected]>wrote:
> Hi all, > > I have a question pertaining to two node cluster, I have RHEL 5.5 and > cluster along with it which at least should have two nodes. > > In a situation where both nodes of the cluster are up, and have reliable > connection to fencing device (e.g. power switch OR any other power fencing > device) and heartbeat link between two nodes goes down. > > Each node finds another node is down (because heartbeat IP becomes > unreachable) and tries to fence each other. > > Is this situation possible? If so, can two nodes possibly fence (in short > shutdown or reboot) each other? Is there anyway out of this situation? > This is a fairly common problem called "split brain". The two nodes will go into a shootout, fencing each other. There are a few ways to prevent this, such as redundant network links and the use of quorum disks.
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