I have half a dozen xxxxx-flat.vmdk files that have a persistent exclusive lock as determined by vmkfstools -D xxxxx-flat.vmdk
The disks have been removed from the VM that they originally belonged to, and it has since been rebooted a number of times. I'd prefer to reconnect these disks, but at this point the offending disks cannot even be deleted from the datastore.
The mac address owning the lock is a NIC on the local host, however the locks persist across a VM reboot and even a reboot of all of the hosts in the cluster, as well as dismounting and remounting the VMFS volume.
I've checked and no other VMs are accessing these disks, or have references to them in their config files.