Please see comments section..
Vendor had adjusted mpt controller's firmware with alternative path info regarding multi-port disk support. The raidctl should handle this info with RAID config actions, otherwise the second path which is not involved in RAID config action will be un-touched, which means an invalid path remains with volume creation, or second path not recovered with volume deleting. Further more, 2 paths from a single disk involved with a volume creation will raise a failure and should be avoided.