load balancing at fastmail.fm

[Rob Mueller]

> I agree that storage and replication are orthogonal issues. However, if a 
> lump of storage is no longer a single point of failure then you don't have 
> to invest (or gamble) quite as much to make that storage perfect.

Yes, that old maxim that each extra 9 in 99.99... reliability costs 10 times 
more.

Also a nice thing about replication is allowing controlled upgrades/changes 
to systems with almost no visible user downtime by controlled failing of all 
the masters off a particular machine. Nice.

Rob