[CentOS] clustered mail server?

Mon May 19 10:01:46 UTC 2008
Christopher Chan <christopher at ias.com.hk>

Ralph Angenendt wrote:
> Christopher Chan wrote:
>> Ralph Angenendt wrote:
>>> No and yes. You can just use ext3 on both nodes as you normally only
>>> have the one on the primary node mounted - the other one is not accessed
>>> by anything. And yes, with heartbeat you "just" failover to the second
>>> node, if the first one is dead. That will start the needed services on
>>> the second node.
>> Are you positive that you can put ext3 on it and have it mounted on the 
>> secondary while the primary is happily hammering away without any ill 
>> effects? Have you done it?
> No, you do *not* mount it on the secondary while the primary is happily
> hammering away. heartbeat takes care of mounting and of the secondary
> becoming primary in case of a failover.

Yes, I am sorry, I did not read your mail through. Heartbeat takes care 
of the mounting eh?

> There are primary/primary setups possible with drbd and gfs if you need
> both nodes to be exported at the same time - but that's not needed nor
> recommended in a failover situation.

Why would it not be recommended for a failover situation?