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vSphere High Performance Essentials by Christian Stankowic

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Fault Tolerance

In addition to HA, Fault Tolerance can be utilized in order to achieve even more availability. Enabling this technology will create a locked secondary VM, executing the same CPU instructions and nondeterministic events such as inputs and network and disk IO traffic. This patented technology is called VMware vLockstep and requires special CPU support—check the VMware hardware compatibility list for your hardware setup at http://www.vmware.com/go/hcl.

Focusing on high performance setups, there are a couple of things to consider when thinking about Fault Tolerance. Basically, it means doubled consumption of resources such as CPU cycles and memory as a second VM is created. Migrations of FT-enabled VMs might also result in higher CPU ...

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