Dell PowerEdge C6220 II Owner's Manual page 228

When securing the cable tie, make the cable tie go through the second air
hole (from the bottom to the top) and then tighten it to encircle one of the
mini-SAS cables. Ensure the other mini-SAS cable is held by the cable-tie
clip.
Figure 3-55. Cable Tie for 2U Node
228 | Removing and Installing System Components