After DFS exporting a GPFS file system, you may access it from either DFS clients or other GPFS nodes. The other GPFS nodes do not usually utilize DFS or DCE in any form. As such, user access from these nodes to files or directories must be considered local cell access. Since files created from a DFS client are usually tagged with a 128-bit cell identity and since GPFS nodes not utilizing DFS or DCE have no knowledge of cell identity, a special mapping must exist for the local cell. For this reason, files or directories belonging to the local cell or specifying the local cell ACL entries utilize the NIL identifier (128 zero bits) for the local cell. This mapping occurs internally to the file system, but may be visible when examining ACLs via the mmgetacl command. Additionally, files having no ACL or a normal GPFS ACL always belong to the local cell.