Compaq sells Linux Clusters
sumdumgai noted that Compaq is now selling preconfigured Linux Clusters if you happen to have any weather patterns sitting around needing to be analyzed or something. But this is a pretty substantial bit of heft behind Linux as a valid Clustering platform, as well as an easier way to get one.
If anyone had actually taken the time to read the linked page at Compaq, they would have noticed that this is NOT a high-performance (beowulf) cluster.
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This is a high-availibility cluster, the idea being that one of the machines can die without losing anything. Kinda like RAID taken to the systems level.
That linux lacks this has been one of Microsoft's marketing points, so this is a really good thing. Unfortunately, the mirroring software is not open source or free software.