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was until this point mostly limited to VMotion for planned downtimes, and plain reboots of the VM at a different location for unplanned downtimes. This system left applications that couldn't handle a plain reboot out in the cold, so developers were still forced to implement failover systems. All of that is about to change with VMware's new Fault Tolerance feature, however, vSphere's new feature related to HA. Essentially, Fault Tolerance builds a shadow copy for VM's that require the highest possible availability. The shadow copy is a shielded off machine that is completely unaccessible for as long as the original VM is still running, but is synchronized "clock per clock" (or so we've been told) with it. Ideally, from the moment the original VM goes down, the shadow copy is pushed forward and is able to continue the work from the very CPU instruction the original dropped the ball on.Exactly how this is achieved over a standard network connection is something that remains a bit of a mystery to us, more on that later, hopefully.On the security level, VMSafe is built into the hypervisor to function as a sort of virtual firewall, allowing third party developers to plug into its functionality and release a virtual appliance that handles security for VM's whichever way they prefer, acting as an external antivirus that is uncorruptable from within the VM itself.While all of this greatly improves standalone systems just as well, as virtualization continues its steady grow, many administrators find themselves required to manage not just one, but large amounts of physical servers, hosting thousands