i have noticed that  although the beginning of the  dell part is the same (0W4TPR)

but the revision and p/n on it is different :

MY- 0W4TPR-63482 697-0s8e-A01

P/n : 1000803-05

and :

Dell P/n : MY-04WTPR-63482-617-Oc32-A00

P/n: 1000803-04

Hello,

Can you confirm that your replacement process followed the process in the link below? It's also worth noting that it may take 45 minutes to an hour for the software to update the new controller. 

SCv2000 and SCv2020 Storage System Owner’s Manual | Dell US

Hello Dylan.

i confirm that its the process i used.

i have waited for about 20 minutes though not an hour

and the controller still wasn't visible in the GUI.

Let's give it a bit more time then and check back on it once it's had a bit longer to finish it's process. It may well be fine at this point, but we should know for certain before long.

Hello Dylan.

i have waited an hour but still the new controller is not being recognized by the Gui.

any suggestions ?

the error that i received before replacing the controller :

an unrecoverable problem was found with caching hardware on controller during system startup.

the new controller is still not recognized in the Gui:

my question is this , is this the caching hardware  on the controller? :

Hello @lukehy

The error "an unrecoverable problem was found with caching hardware on controller during system startup" is normally related to a cache battery alert. Usually, when this error happens it is important to facilitate a serial connection to Dell Support level 2 for further troubleshooting because not always a controller replacement is required. Is your Compellent still in warranty?

If you followed the procedure for replacement, maybe the new Controller is faulty or the error was not related to a controller replacement. Can you try to install the old controller and verify if the error persist and the old controller is detected at all?

Regards.

Hello Diego.

i have put the old controller back and still got the the same issue .

about the new controllers , we tried a few of them but none of them 
started to initialize.

this Scv2020 is not under warranty.

Hello,

The cache shouldn't be separate from the controller. With both the original and the replacement reporting this same error, the issue may be with the connecting board. The only components I'm seeing in our database are either controllers, hard drives, or SSDs. If you're still able to get into storage center or storage manager, I don't mind looking at a log collection, but you may be best served talking to phone support. The Compellent systems usually have support options, even with an expired warranty. If that log review is something you'd be interested in having done, go ahead and acquire them, then reply with the file size, so we can find the best way to get them. If you'd like to go ahead and speak with phone support, I'd refer you to (800) 456-3355. I expect that there is a decent chance that I may need to refer you to them, even with a log review, but I did want to offer.