During testing, the EMC Isilon storage was successfully reading the Active Directory Attributes but the data was incorrect. The data that was in the uid & gid fields were id’s that were automatically generated by the Isilon storage itself. The id’s that were generated by the Isilon storage took precedence over any mappings that were stored in the Active Directory Schema.

The fix was to delete all mappings from the Isilon storage by logging into the CLI and issuing a

isi_clean_idmap --clean-idmap

… to clean up all the mappings!