Re: [gentoo-user] Server Mirroring...

[Sascha Lucas <sascha.lucas@rus.uni-stuttgart.de>]

>>  easy with postfix: DNS round robin (solution inside DNS Server, nearly all
>>  MTAs are aware of this)
>
> So DNS round robins between the two mail servers. A new mail comes into 
> server1, how does this mail make it to server2.

Yes this is definitely the difficultest part. It must be solved somewhere 
in the LDA (cyrus). The MTA just pass mails to the LDA. So round robin 
should work.

> I don't see that Postgres supports multiple masters either. Circular

I'm not an expert but what about this?
http://www.postgresql.org/about/news.289

> The storage has to reside somewhere. If that site goes down, both servers go 
> down. You either need both servers in the same site with shared storage or 
> figure out how to do a shared nothing backend.

It depends on how both sites are connected. Just like redundancy in 
Servers/Network you can have redundant storage. I.E. with (a)synchronous 
replication over IP or FC-networks.

BTW: I don't know a cluster-solution with cyrus. We use a cluster aware 
commercial one.

Sascha.
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