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[Linux-cluster] High availability mail system



Im trying to put up a high availability mail system with high performance who support up to 300 000 mailboxes using a linux cluster.
 
I have looked around for open source cluster solution, but so far only found solution like SAN for shared filesystem with high performance.
 
Any suggestion how to solve the issues using open source software?
 
The system should support 
- Mailbox replication
- Mailbox synchronization
- Redundancy both in hardware and software
- The system is to be build with low cost computers
- One shared filesystem without external storage like SAN
- Scalable
 
/Robert Olsson

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