Dell PowerVault 211S (SCSI) - Manual (Page 90)

7-32 Dell PowerVault 200S, 201S, 210S, and 211S Storage Systems Installation and Service Guide
4. Using a Phillips-head screwdriver, tighten the captive screw at the top of the sec-
ond module to secure the module to the chassis.
5. Attach the SCSI cable to the second module.