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VMware vCenter Cookbook by Konstantin Kuminsky

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Ensuring 100 percent uptime for critical VMs

For VMs that need to be up 100 percent of the time and do not tolerate even a brief interruption caused by a reboot as a result of host failure, vSphere offers a continuous availability option called Fault Tolerance (FT).

FT creates and maintains an exact copy of a running virtual machine—secondary VM—on another host. Both VMs exchange heartbeats to monitor each other's status.

Ensuring 100 percent uptime for critical VMs

When a host with a primary VM fails, the secondary VM becomes active almost instantly. There is a little delay but clients do not see the interruption. As everything that happens on the primary VM replays on the secondary one, this ...

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