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Just a small update...
I've just finished working on a solution which for full reduntancy involves only 4 servers in total....
for simple load balancing and service monitoring only 3 machines are needed.
Hows this sound to you guys... Just removed a big portian of the cost. It's done by using a GNDB filesystem on the 2 application servers with non-shared mirrored storage in the cluster and GFS clients... I'm still testing it..
Also have been testing mysql 5.x cluster which seems a lot more promising than the previous versions.
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