openMosix Project (closed as of March 1, 2008)
This is Linux clustering software. Typical clusters (Beowulf) are application dependent: apps have to be written to take advantage of the cluster to gain performance benefits. OpenMosix is transparent clustering - processes migrate to other members automagically.
They apparently now use the GFS filesystem.
As this kind of thing becomes more and more easy to implement, I'm sure we'll see more and more simple clusters, probably adopted for reliability more than performance. I've been thinking about doing this myself just to not have to worry about a particular machine crashing. Why not? Hardware is cheap, and while this may be a little complicated to implement just now, it is only going to get easier.
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