[CentOS] clustered mail server?

Mon May 19 09:41:34 UTC 2008
Ralph Angenendt <ra+centos at br-online.de>

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.

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.

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