IBM Slicestor 2448 Appliance Operation Manual page 27

Figure 5. Attach the rack rails to the rack
2. Attach the front mounting bracket to the rack rail.
3. Attach the rear mounting bracket to the rack rail.
Unlock the rails to insert or remove the chassis
1. With a suitable lift or with four people, align the chassis with the extended rails.
2. Continue to close until the side rails lock.
3. After the server is partially inserted into the rack rails, remove the server-side handles.
4. Place the handles back in the drive carriers and replace the carriers into the back of the server.
5. Move the lever to the unlock position to close or remove the chassis, as shown in the following figure.
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Chapter 3. Install the appliance into a rack