IBM DS3500 Installation, User's, And Maintenance Manual page 126

To install a controller in the storage subsystem, complete the following steps:
10. Install the new controller.
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IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
1. Read the safety information that begins on page "Safety" on page ix and "Best
practices guidelines" on page 8.
2. Remove the existing storage subsystem using IBM System Storage DS Storage
Manager.
3. Install new dual-controller NVSRAM firmware on controller A. For
instructions to download the NVSRAM firmware, see the IBM System Storage
DS Storage Manager Version 10 Installation and Host Support Guide (for DS
Storage Manager V10.77 or earlier) or the IBM System Storage DS Storage
Manager Version 10.8 Installation and Host Support Guide (for DS Storage
Manager V10.83 or later).
Note: Obtain the latest dual-controller NVSRAM firmware from
http://www.ibm.com/servers/storage/support/disk/.
4. Start the command-line interface; then, enter the following command to
change controller A from simplex (single-controller) mode to duplex
(dual-controller) mode:
Smcli ctlr_A_IP_address -c "set storageSubsystem redundancyMode=duplex;"
5. Shut down the storage subsystem, and then start it again (see "Turning on the
storage subsystem" on page 82). If controller A was successfully converted to
duplex mode, the Recovery Guru reports an alternate controller missing
error message. If the error message is not reported, reinstall the new
dual-controller NVSRAM firmware on controller A and repeat steps 4 through
5.
6. Unpack the new controller. Save all packing materials in case you have to
return a controller.
7. Ensure that both controllers have the same host port adapter, DIMM size, and
options.
8. If controller A contains an optional host port adapter, install an identical
optional host port adapter in the new controller. See "Installing an optional
host port adapter or replacing a failed host port adapter" on page 116 for
instructions.
9. Remove the controller filler panel from the bay:
a. Open the two release levers. The filler panel moves out of the bay
approximately 0.6 cm (0.25 inch).
b. Pull the filler panel out of the bay.
c. Place the filler panel in a safe place for future use.
Note: The following illustration shows installing controller A. Be sure to
install the new controller in the rightmost bay, as controller B.