VMware Fault Tolerance

Incredible news from VMworld 2008 outlines a completely new way of building fault tolerant systems, using VMware virtual machines in such a way that you actually run two instances of the same server at the same time, the other instance is just not connected to the network.
Check out this great blog entry outlining the functionality (and some caveats). Seems like a treat if it Actually Works[tm], will need to check it out.

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