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.
On the Linux operating system, SDD is aware of the preferred paths that are set by SAN Volume Controller for each VDisk. When failing over paths, SDD tries the first preferred path, then the next known preferred path, and so on until it has tried all preferred paths. If SDD cannot find an available path using the preferred paths, it begins trying non-preferred paths. If all paths are unavailable, the VDisk goes offline.
SDD on the Linux operating system does not perform load balancing across the preferred paths.