[Linux-cluster] Two node cluster - a potential problem of node fencing each other?

Parvez Shaikh parvez.h.shaikh at gmail.com
Sun Mar 13 13:57:46 UTC 2011


redundant network link - i trust you were referring to ethernet bonding.

On Sun, Mar 13, 2011 at 1:19 PM, Ian Hayes <cthulhucalling at gmail.com> wrote:

> On Sat, Mar 12, 2011 at 11:19 PM, Parvez Shaikh <parvez.h.shaikh at gmail.com
> > 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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