Turn on the "Locate" LED for specified device(s)
sudo ledctl locate=/dev/sda,/dev/sdb,...Turn off the "Locate" LED for specified device(s)
sudo ledctl locate_off=/dev/sda,/dev/sdb,...Turn off the "Status" LED and "Failure" LED for specified device(s)
sudo ledctl off=/dev/sda,/dev/sdb,...Turn off the "Status" LED, "Failure" LED and "Locate" LED for specified device(s)
sudo ledctl normal=/dev/sda,/dev/sdb,...