The mpt driver has been enhanced to support MPxIO with supported storage devices. When MPxIO is enabled for Serial Attached SCSI (SAS) and SATA devices, they are enumerated under scsi_vhci(7D) just like fibre channel devices under fp(7D).
Starting with this release, stmsboot(1M) has also been enhanced to support multipathed SAS devices. stmsboot(1D) operates on all attached and multipath-capable controllers by default.
If you wish to only enable multipathing on fp or mpt controllers then you can use the new flag which has been added to restrict operations. The command, /usr/sbin/stmsboot -D mpt -e, will enable MPxIO only on attached mpt controllers. Replacing mpt with fp in this command will make stmsboot enable MPxIO only on attached fp controllers.