This read-only object mirrors the `rn` property of a catalog definition describing which storage-management features a particular disk-controller type supports inside Cisco UCS Manager's internal information model, exposed here as a text string for this disk-controller type definition. The rn is just this object's own naming segment -- the last component appended to its parent's dn to build the full path -- rather than the whole path itself. For the definition for a MegaRAID-based SAS controller, the rn might be a short token like ioexpander-1 or locator-led-1, which UCS Manager concatenates onto the parent blade's dn.