Oracle EXADATA X7-2 EF Installation Manual page 57

Install the Cable Management Arm (Optional)
d. Verify that the CMA extends fully with the slide-rails.
13. To return the storage server to the rack:
a. Simultaneously pull and hold the two green release tabs (one on each side
of the storage server) toward the front of the storage server while you push
the storage server into the rack. As you push the storage server into the
rack, verify that the CMA retracts without binding.
Installing the Storage Server Into a Rack 57