mail server replication

[Rob Siemborski]

On Thu, 20 May 2004, Paul Dekkers wrote:

> I hope this kind of functionality comes into cyrus once; I assume it is not 
> there yet, I once asked this on the list before ;-) And maybe it shouldn't be 
> too difficult, since there is already a synchronisation mechanism for NNTP in 
> place, if I'm correct.

This is very hard -- if not impossible -- with only two machines, at the 
very least you'd need three in order to maintain a quorum of what the 
"real view" of the server is --

For example, think about what would happen if there was a network 
partition and two different messages were delivered to the split servers 
at the same time.  It's not an easy problem to solve-- keeping a hot spare 
is definately the way to go.

-Rob

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Rob Siemborski * Andrew Systems Group * Cyert Hall 207 * 412-268-7456
Research Systems Programmer * /usr/contributed Gatekeeper

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