This read-only object mirrors the `descr` 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. This is the free-text description field UCS Manager stores for this disk-controller type definition, though in practice it is usually populated (or left blank) automatically from catalog data rather than typed in by an admin. On most systems this returns an empty string for the definition for a MegaRAID-based SAS controller, but when populated it typically echoes the same descriptive text shown next to the item in the UCS Manager GUI.