In the past, you could only rely on vSphere HA which would automatically restart your vCSA in case of the hardware failure, but this might lead in the corrupted system state as with any other OS.
If you aren’t familiar with vCenter HA, it is a feature introduced in vSphere 6.5 and available only for the vCSA. When you enable vCenter HA, secondary passive vCSA is deployed along with the witness appliance.
vCenter HA provides short RTO (about five minutes) for recovery of the vCenter Server. When the hardware where the active node is running fails, the passive vCenter Server will take over, shortening the total downtime of the vCenter Server. vCenter HA is a part of the vCenter Server Standard license, so no additional licensing is required.
vCenter HA is only available in the vCSA, and you can't deploy this configuration with vCenter for Windows.
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