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>> easy with postfix: DNS round robin (solution inside DNS Server, nearly all |
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>> MTAs are aware of this) |
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> |
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> So DNS round robins between the two mail servers. A new mail comes into |
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> server1, how does this mail make it to server2. |
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Yes this is definitely the difficultest part. It must be solved somewhere |
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in the LDA (cyrus). The MTA just pass mails to the LDA. So round robin |
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should work. |
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> I don't see that Postgres supports multiple masters either. Circular |
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I'm not an expert but what about this? |
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http://www.postgresql.org/about/news.289 |
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> The storage has to reside somewhere. If that site goes down, both servers go |
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> down. You either need both servers in the same site with shared storage or |
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> figure out how to do a shared nothing backend. |
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It depends on how both sites are connected. Just like redundancy in |
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Servers/Network you can have redundant storage. I.E. with (a)synchronous |
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replication over IP or FC-networks. |
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BTW: I don't know a cluster-solution with cyrus. We use a cluster aware |
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commercial one. |
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|
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Sascha. |
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-- |
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