IBM FAStT500 User Guide - Page 52

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 storagemanagement software to verify the firmware levels. 5 Using Figure 17 as a guide, check the controller indicator lights. Power Power supply Controller fan Controller Fast write cache Figure 17. Indicator lights on the controller unit bezel a If the green power indicator is on and the amber fault indicator is off, go to Step 6. b If the green power indicator remains off or the fault indicator is on after a few seconds, make sure that the controller CRU is locked into place. If the fault indicator remains on, go to Step c. c Use the storage-management software to check the status of both controllers. If applicable, perform the recovery procedures required by the software. If this corrects the fault and the controller unit is operating without error, go to Step 6. If not, go to Step d. d Replace the controller CRU. Then, if there are no error messages or controller faults, go to Step 6. e If the problem is not corrected, call for service. 6 Replace the controller unit bezel, as shown in Figure 7 on page 11. Installing additional cache memory in a controller The controller comes with 256 MB of cache memory installed. You can add an additional 256 MB dual inline memory module (DIMM) for a total of 512 MB cache, with the IBM FAStT500 256 MB Cache option. 32 IBM FAStT500 RAID Controller Enclosure Unit User's Guide