IBM System x3650 M3 4255 Installation And User Manual page 104

25. Connect the SAS signal cables from the connectors on the M5015 adapter
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System x3650 M3 Types 4255, 7945, and 7949: Installation and User's Guide
b. Connect the SAS signal cable from the right front connector of hard disk
drive backplane 1 to the upper connector on the M5015 adapter (as facing
the front of the server).
installed on the back of the server. Route the cable underneath the cable
retention features on the baffle. See the illustration.
a. Connect the shorter SAS signal cable to the left front connector of hard
disk drive backplane 2.
b. Connect the longer SAS signal cable to the right front connector of hard
disk drive backplane 2.