Regarding step 4, if you install vCenter 5,1 pointing to the existing db, then the existing inventory of 4.1 hosts will be present. Precautions: - Donot remove ESXi 4.1 from inventory of vCenter 4.1 since that would mean you cannot add the ESXi back as the VMs are running in EVC mode. - recommend to shutdown vCenter 4.1 during upgrade of vCenter 5.1 VM. - Donot upgrade your existing datastores to vmfs5. - Take a backup of db before doing the upgrade. - regarding db clustering , i am not quite sure if the clustering needs to be broken during the upgrade Rest is good
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