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The SecondSite project (now part of Remus) is exploring applications of virtualization in order to make existing computer software highly available and disaster tolerant. Using a highly optimized form of live migration, we continuously replicate the memory image of a running virtual machine onto a second physical computer. In the case of failure, this second computer can seamlessly continue execution so fast that open network connections remain functional. The major benefit of this approach is that applications and operating systems don't have to be modified in order to benefit from HA -- this sourse of complexity has been a major limitation in providing HA and DR in existing systems.
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