Here are the steps: - Upgrade your vCenter 4.1 to 5.1. - Once done, yes vCenter 5.1 can manage your 4.1 hosts. - Now put your one ESXi 4.1 in maintenance mode and migrate all your VMs to other 4.1 hosts. - Once the ESXi 4.1 host is upgraded , you can bring the old VMs back and migrate other. Precautions: - Donot upgrade virtual hardware of the VM from 7 to vmx-09 since ESXi 4.1 cannot manage vmx-09 based VMs. - Donot upgrade your datastores from vmfs3 to vmfs5. - Also before upgrading your vCenter, take a snapshot of VC VM and vCenter database VM so that you can revert back if vCenter 5.1 install fails
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