Le 22/05/2013 02:13, Alex Samad - Yieldbroker a écrit :
> >Any help or suggestions muchly appreciated
> >
>
>Also, fencing!
Not sure that I need it. The app is always running on both nodes, it's just the
ip address that is shared
A cluster without fencing is not a cluster, by definition. Proper
fencing should be at least two different methods, eg: IPMI + PDU.
Some peoples live with clusters without fencing, they mostly rely on
luck and luck is not very "High Availability".
If you want a proof that you need it, just drop all corosync network
traffic => split brain, you have two masters on your network until an
admin fixes it.
You could also wait for a failover where the VIP or (any resource) will
fail to properly stop, the cluster doesn't know what do to on
stop-failures (beside fencing), it freezes in this weird state => you
have two slaves on your network until an admin fixes it.
--
Cheers,
Florian Crouzat
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