I added a refurbished Smart Array P822 controller (with 2GB FBWC cache) to a DL380 G7 server. I'm getting the following error in IML.
Using the ACU I see that the cache module is permanantly disabled and capacitor 1 is recharging. I was getting that message for 48 hours. Noticing some visible damage to the capacitor's cable, I ordered a new one from HPE. After installling that I checked the ACU and the same issue persisted. I checked again after 24 hours to no avail. Finally I checked the LEDs on the cache module (LED3: on, LED2 and LED 1 off) and according to this troubleshooting doc the cache module is idle and the capacitor is charged. Also the heartbeat LED on the controller is flashing once a second.
The ADU report for the array, with the new capacitor installed.
Update: The firmware version is 8.32