Marathon Technologies offers an interesting fault tolerance solution for Windows using virtualization technology. Server virtualization usually means that you have multiple virtual servers running on one physical server. EverRun FT is software that does the opposite. It unites two physical servers to one virtual server.
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So its purpose is not server consolidation but fault tolerance. This sounds like server clustering. However, there are some fundamental differences.
The biggest advantage of EverRun FT compared to clustering solutions is that the applications don't have to be cluster-aware. Furthermore, there will be no failover if one of the servers breaks down, i.e. the virtual server will continue running without any downtime.
The disadvantage is that both physical servers have to be absolutely identical. You even have to patch them simultaneously. During the patching process you will have a short downtime.
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This technology seems to be very promising to me. The price of $14,000 is not so promising though.