Welcome to the Communities..
Have you tried this syntax as mentioned the KB
vmkfstools --server <vCenter IP/Hostname> -E '[Datastore Name] Directory Name/examplevm.vmdk' '[Datastore Name] Directory Name/examplevm-renamed.vmdk
Welcome to the Communities..
Have you tried this syntax as mentioned the KB
vmkfstools --server <vCenter IP/Hostname> -E '[Datastore Name] Directory Name/examplevm.vmdk' '[Datastore Name] Directory Name/examplevm-renamed.vmdk