Hello dchapman00,
The NMP SATP claim rules specify which SATP should manage a particular storage device. The NMP supports all storage arrays listed on the VMware storage Hardware Compatibility List (HCL) and provides a path selection algorithm based on the array type. The NMP associates a set of physical paths with a storage device (LUN). A Storage Array Type Plugin (SATP) determines how path failover is handled for a specific storage array. A Path Selection Plugin (PSP) determines which physical path is used to issue an I/O request to a storage device. SATPs and PSPs are plugins within the NMP plugin.
You may delete the existing rule and add a new rule for the new Adaptec 2120S SCSI controller in ESXi 5.5 U2.