megaraid,N - [Linux only] the device consists of one or more SCSI/SAS disks connected to a MegaRAID controller.  The  non-negative
              integer N (in the range of 0 to 127 inclusive) denotes which disk on the controller is monitored.  Use syntax such as:
              smartctl -a -d megaraid,2 /dev/sda
              smartctl -a -d megaraid,0 /dev/sdb
              smartctl -a -d megaraid,0 /dev/bus/0
              This  interface will also work for Dell PERC controllers.  It is possible to set RAID device name as /dev/bus/N, where N is a SCSI
              bus number.

              The following entry in /proc/devices must exist:
              For PERC2/3/4 controllers: megadevN
              For PERC5/6 controllers: megaraid_sas_ioctlN

egrep '(megaraid_sas_ioctl)|(megadev)' /proc/devices

for i in 0 1 2 3 4 5 6 7 8 9 ; do smartctl -h -d megaraid,$i /dev/sda ; done


for i in 0 1 2 3 4 5 ; do smartctl -H -d megaraid,$i /dev/sda ; done


for i in 0 1 2 3 4 5 ; do smartctl -H -d megaraid,$i /dev/bus/0 ; done


my @devices = `smartctl --scan`;
chomp @devices;

while ( my $device = shift @devices ) {
   if ( $device =~ m/([a-z0-9/]+)\s+(-d [^ ]+) # (.*)$/ ) {
      $devices{$2}{$1} = $3;
   } else {
      die "could not parse [$device]\n";
   }
}