IBM 9009-41A Manual page 102

Figure 79. Reconnecting the SAS cable in the 18-drive expanded function configuration
For information about SAS cable part numbers, see 9009-41A, 9009-41G, 9009-42A, 9009-42G, or
9223-42H system parts (http://www.ibm.com/support/knowledgecenter/POWER9/p9ecs/
p9ecs_914_924_parts.htm).
6. Fully seat all the front drives and front fillers if present into their slots as shown in the following figure.
Push drive lever (A) until the front drive and front is seated and the lever snaps closed.
88 Power Systems: Power Systems: Drive backplanes