This is the Relative Name (RN) of a storage controller object: the single naming component that, combined with its parent's DN, distinguishes this storage controller from any sibling instances under the same parent. Admins rarely read the RN by itself, but UCS Manager and management tools use it to build and parse the full DN path so each instance of a physical storage controller, such as a RAID or HBA controller, installed in a server can be addressed uniquely. For instance, when a server has several storage controllers attached, the RN is the piece that differs between their otherwise-identical parent DNs, letting a script enumerate all of them.