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replication and failover

Next step in our project* is to provide some sort of failover.  After
years of fantastic uptime, we've had two seperate network connectivity
issues in the last week (one ISP related, one literally 'oops, bumped
the cable' related).  We have an opportunity to setup a machine in a
server room a couple of states away, which ought to be wide enough to
cover 'natural disaster or terrorist activity', but I'm unsure how to

The main (only, really) problem is replicating the mysql database.  I'd
prefer the alternative server to be perfectly usable all the time, and
run in some sort of round-robin fashion.  That means, however,
duplicating all the data on our primary server over to the secondary.  I
looked into the two replication methods for mysql and have found
problems with both.  Traditional master/slave won't work, as that has
one point of failure for writes: the master (negating the whole reason 
for doing this).  And it appears clustering won't work, as we won't have 
anything even close to 100Mbit connection between the two (which the docs 
say is needed).  Any ideas for how to go about this?


*postfix/dspam/mysql mx scrubbing, for those of you playing along at home

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