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As an OpenShift user, I need to span my clusters across multiple vCenters so that I can take advantage of multi-vCenter support. This will help me achieve better utilization, availability,  , and redundancy across vCenter sites. 

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presently, only a single vCenter is allowed to be defined. the maximum number of allowed vCenters will take some thought but let's start with 3 for now.

see: https://github.com/openshift/api/blob/master/config/v1/types_infrastructure.go#L1325-L1334

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• Payload testing passes for the following job types:
  • IPI tech-preview and non-tech-preview vSphere jobs
  • UPI tech-preview and non-tech-preview vSphere jobs

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