IBM System x3550 M3 Type 4254

v ServeRAID-M10i adapter: Take the signal cable that is attached to the drive
backplane for drive bays 0 through 3 and connect it to the connector on the
ServeRAID adapter connector that is closest to the power-supply cage.
Connect the other signal cable so that is attached to the drive backplane for
drive bays 4 and 7 and connect it to the other connector on the adapter.
204 IBM System x3550 M3 Types 4254 and 7944: Problem Determination and Service Guide