Installing The Support Rails - IBM DS4800 User, Installation And Maintenance Manual

3. If necessary, stop all I/O activity to the devices in the rack cabinet.
4. If necessary, turn off all storage expansion enclosure and rack cabinet power.
5. Install any additional interface cables and power cables.
After you have completed these steps, continue with "Installing the support rails."

Installing the support rails

Use the following templates and instructions to identify the proper locations for
inserting M5 screws when mounting the support rails and DS4800 to a rack cabinet.
The locations for the M5 screws are highlighted in the templates.
Hold the appropriate template up to each side of the rack cabinet at the 4–U
section where you will install the DS4800. The highlighted squares on each side of
the template mark the positions where you will thread the M5 screws that secure
the rails and the DS4800 to the front and rear of the cabinet.
Note: If you want to tear out the templates from this document for easier use, use
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IBM System Storage DS4800 Storage Subsystem: Installation, User's, and Maintenance Guide
Disconnect existing power, network, and other external cables.
the copies provided in Appendix C, "Rack mounting templates," on page 181.