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It's on a single computer, with a second as failover, but it's in a colo center, not under a desk. Well, I suppose it could be under a desk.

I remember something about the database being a flat file / flat files. Is that (still) true? How are the two machines being synchronized?

You can always run it over NFS.

I'd be curious to peek at HN Source code. I recall there was a version posted online but it's several years old.