The small .vmdk file is just a descriptor file which points to the -rdm.vmdk. The -rdm.vmdk file itself is a mapping file for a raw device map (RDM), i.e. a LUN on a storage system. I'm a little bit confused about the 60GB you mentioned, because the size of the mapping file shows the RDM as a 250GB LUN!?
What happened prior to the issue? Did you remove/unpresent the LUN on the storage?
Please compress/zip the .vmx, .vmdk (descriptor) as well as the vmware*.log files and attach the .zip file to your next reply post to see whether this helps understanding what causes the issue.