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Re: Mail Cluster

On Fri, Apr 04, 2003 at 09:58:19AM -0600, Mike Kercher wrote:
> POP3 will be the problem since the 2 servers would be about 300 miles apart

Then the best suggestion I can come up with would be to rsync regularly
- like every few minutes.  Your mail spool will then be close to being
in sync although there will always be a possibility that you've accepted
the mail message but not yet sync'ed it to the other server.  If each
server has mirrored disks, though, your chance of a mail loss are fairly
slim.  There are mail methods that use databases for the back end and
you might be able to find a high-availability solution that way, but you
could find the price or complexity prohibitive.

With the POP3 mail spool being rsync'ed to another host, you have to
make sure that that the POP3 service isn't actually started on the other
host - just fail over the A record when the first host dies and start
the service then.  You don't want to people to be able to receiving mail
on both servers simultaneously.

Ed Wilts, Mounds View, MN, USA
mailto:ewilts ewilts org
Member #1, Red Hat Community Ambassador Program

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