In-Place Upgrade Only for Virtual Machines with RDM Disks (2204)
Currently, you cannot migrate powered-on and powered-off virtual machines with raw device maps (RDMs). This means upgrade procedures that use migration to reduce virtual machine downtime are not possible when virtual machines with RDMs are involved. Only an upgrade without migration is possible.
Use an in-place upgrade procedure with no migration. Refer to "Upgrading Hosts Sharing a SAN with In-Place VMFS Upgrade" in the VMware Virtual Infrastructure Installation and Upgrade Guide.