Tim Jackson wrote: > [EMAIL PROTECTED] wrote: > >> I am currently trying to setup multiple mail servers so should the smtp >> server go down, we will receive mail to our of our other smtp servers, >> then when the original server comes back, the mail is passed on there. > > [... replication of mailstore using unison ...] > >> Can anyone see any potential problems with this method..... or do you >> think it will work fine? > > I would think you would be better off replicating the maildirs using > DRBD (www.drbd.org) between the two machines; it will provide more > "seamless" failover, as well as up-to-the-second replication. >
This is indeed a good solution, but unfortunately, it only works if you are using linux. The problems using unison are however somewhat important: 1: It's is not synchronous replication (that means you can lose mails if the "main" server crashes and sync isn't done yet) 2: Unison needs to fstat() all files when looking for updates, this can take some time, and is using quite a bit of disk I/O. But your filesystem cache may help in this case. There are also some optimizations that can be done in the config to help mitigate this point.
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