IBM 7947E3U User Manual page 82

66
System x3650 M2 Types 4199 and 7947: Installation and User's Guide
7. Disconnect the SAS signal cables from the SAS controller, which is connected
to the SAS riser card. Leave the other end of the SAS signal cables connected
to the hard disk drive backplanes.
8. Remove the SAS controller assembly from the server; then, remove the SAS
controller from the SAS riser card. See "Removing a ServeRAID SAS
controller from the SAS riser card" on page 97 for instructions.