This read-only integer (0-255) reports the major version number of a hardware/firmware component, interpreted as a plain decimal digit such as the '2' in version 2.14. Admins use it to quickly tell whether a component is running an old major release that might lack features or fixes found in a newer major line. For instance, seeing cpqnVersionMajor return 1 on one unit and 2 on another in the same stack flags a firmware mismatch worth investigating.