Hosts that run the Linux operating system do not support Subsystem Device Driver (SDD) dynamic pathing. If you use a QLogic or Emulex device driver, you must reload the device driver to pick up the new paths.
SDD is a multipathing driver for older distributions of Linux that do not support the native DMMP.
On the Linux operating system, SDD is aware of the preferred paths that the system sets for each volume. When failing over paths, SDD tries the first preferred path, then the next known preferred path, and so on, until it tries all preferred paths. If SDD cannot find an available path by using the preferred paths, it begins trying non-preferred paths. If all paths are unavailable, the volume goes offline.
SDD on the Linux operating system does not perform load balancing across the preferred paths.