From my understanding the best approach is, install ESXi on the two new servers, add them to the existing vCenter, and then migrate the VMs including vCenter server to new ESXi hosts and then decommi...
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From my understanding the best approach is, install ESXi on the two new servers, add them to the existing vCenter, and then migrate the VMs including vCenter server to new ESXi hosts and then decommission old ESXi hosts from the environment. This is a high level suggestion and if you need more info for a better approach we might require some additional details about your environment. Like existing server specs, new server specs, ESXi and vCenter versions, Shared storage availability etc. please thumbs up if this helps.