I’m currently in the process of migrating a 2-host High Availability cluster of ESX 3.5u4 servers to vSphere 4. This is going to come in 3 distinct stages: Stage 1 is to upgrade VirtualCenter Server 2.5 to vCenter 4, which I am going to cover today. Stage 2 is to upgrade each host, and will be covered as I do it. Stage 3 is the upgrade of the Virtual Machines to the latest VMware Tools and then the new VM hardware.
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