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Chapter 3. Replacing controller unit components 31
Figure 16. Removing and installing a controller CRU
Attention: To avoid potential data loss, make sure that the new controller has the same
memory size as the one you are replacing. If you install a controller with a
different memory size, the storage-management software suspends cache
mirroring and issues an error message. If the memory size is not the same,
you need to upgrade the cache memory. For more information, see
"Installing
additional cache memory in a controller" on page 32 .
3 Unpack and check the new controller.
Using the proper handling precautions, remove the new controller from the packing
material. Check the shipping invoice and the controller to make sure that it has the
same memory size as the controller that you just removed.
4 Using Figure 16 as a guide, install the new controller as follows:
a Squeeze the two center tabs and open the handles.
b Using the handles, slide the controller into the slot until the back edge hooks onto
the frame.
c Close the handles and snap into place.
Attention: When you replace a failed controller, the storage-management software
automatically synchronizes the firmware between the existing controller and
the new controller. After replacing a controller, always use the storage-
management software to verify the firmware levels.