RAID
It is unlikely that a hardware RAID controller will directly support smartmontools. A SCSI RAID controller is a virtual target device that essentially remaps the SCSI commands it receives to the physical disks on its internal buses. The physical disks in a "SCSI" RAID could be ATA or sATA disks, in this case a SCSI bus is used between the host computer and an external RAID controller since LVD SCSI buses (SPI-2,3 and 4) can run up to 25 metres (plus other protocol related issues).  
 
Some SCSI RAIDs equipped internally with SCSI disks allow access to the physical disks via logical unit numbers (LUNs) greater than 0. The SCSI RAID controller itself takes LUN equal to 0. In this case smartmontools could be applied to the LUNs greater than 0 that refer to physical disks.  
 
Some SCSI RAIDs equipped internally ATA disks have a mechanism that allows ATA commands to be tunnelled to the ATA disks. The 3ware 6000 and 7000 series Escalade controllers are examples. In this case, special provision has been made in smartmontools (starting with release 5.1-16) to tunnel the ATA command required through to the physical disks. This is done by using the smartctl/smartd -d 3ware,N option/Directive. Please see the smartctl and smartd man pages for details.