Lenovo ThinkSystem DE Series Manual page 13

2. Label each cable that is attached to the controller canister.
3. Disconnect all the cables from the controller canister.

To prevent degraded performance, do not twist, fold, pinch, or step on the
cables.
4. If the host ports on the controller canister use SFP+ transceivers, leave them installed.
5. Confirm that the Cache Active LED on the back of the controller is off.
6. Squeeze the latch on the cam handle until it releases, and then open the cam handle to the
right to release the controller canister from the shelf.
The following figure is an example of a DE2000H/DE4000H (2U12) controller shelf,
DE2000H/DE4000H (2U24) controller shelf, or DE4000F flash array:
(1) Controller canister
(2) Cam handle
The following figure is an example of a DE4000H (4U60) controller shelf:
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