Adding and removing SAS devices is performed dynamically when using the mpt driver. You are no longer required to edit the sd.conf file to enable your system to detect specific targets and LUNs attached with the mpt driver. For more information see mpt(7D) and mpt_sas(7D).
If you add or remove a device in your SAS domain, messages are written to the /var/adm/messages file indicating its presence or removal. If a device has been added, it is visible to and available through the format command.