IBM System Storage DCS3700 Installation, User's, And Maintenance Manual page 114

Attention:
v If you are replacing a failed controller with a replacement controller from IBM Service, check to ensure
that you have ordered the replacement controller that contains the same amount of cache memory that
is installed in the failed controller. Also, transfer the cache backup battery and cache backup flash
memory module to the replacement controller. Transfer the battery and flash memory exactly as
described in this procedure; failure to remove and insert these items in the correct sequence can
damage the controller.
Procedure
1. Read the "Safety" information and "Best practices" information found in the prolog and Chapter 1 of
this document.
2. Use the Storage Manager software to print a storage subsystem profile. Move logical drive
ownership to the other controller. If the controller that you are replacing has failed but is still
operating, move the failed controller to the Offline state.
Attention: Never remove a controller unless the OK to remove LED is lit. Doing so can result in a
loss of data.
3. Locate the failed controller by checking the amber LEDs on the controllers in the storage system.
4. Is the OK to remove LED lit?
v Yes: Go to step 5.
v No: Another component might require attention before you can remove the controller. Use the
Recovery Guru in the Subsystem Management window to identify and correct any additional
failures. If there are none, proceed with step 5 to replace the controller.
Attention: Static electricity can damage the storage subsystem and other electronic devices. To
avoid damage, keep static-sensitive devices in their static-protective packages until you are ready to
install them.
5. Unpack the new controller. Save all packing materials in case you have to return the new controller.
6. Determine whether the replacement controller will be controller A or controller B (controller A is
installed in slot SBB A; controller B is installed in slot SBB B), and then apply the controller labels for
host ports and drive expansion ports to the replacement controller. The controller labels and
instructions are included with the replacement controller. Make sure that the labels are aligned
correctly and do not cover any connectors or LEDs.
Attention: Handle and install cables correctly to avoid degraded performance or loss of
communication with devices. See Chapter 3 "Cabling the DCS3700" for more information.
7. Disconnect all attached interface cables from the failed controller. Be sure to label each cable so that
you can reconnect it correctly to the new controller.
8. Remove the controller from the chassis
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IBM System Storage DCS3700: Installation, User, and Maintenance Guide