Ok -- so Remove-Datastore seems to have done the trick. However I am noticing one small issue to this, it appears to wipe the partition information from the disk when it does the removal? I am not sure how, since the devices have been detached from VMware, I thought through the earlier functions that were run. But I ran the Remove-Datastore and now mounting those disks onto our DR system, it is showing them as unknown partitions and unable to mount the existing VMFS data that was on the disk.
The ultimate goal here, is to take the SAN LUN, and mount it on the DR hosts and have them use the existing signatures/VMFS datastores as they will only ever be mounted in one location. I am thinking this makes more sense than resginaturing, that way anything that was using these datastores will not notice any real change as the signature and all underlying attributes are not changed. But I can't seem to get this to work, and if I do the resignature method, then we end up with having to rename all of the volumes from snap-*-<vol name> back to just <vol name>.
Any thoughts or recommendations on how to best achieve this?