Hello everyone.
Has anyone had any experience replacing the RAID controller module on a Dell MD3420? Or a similar storage system?
Let me explain the problem. I have a Dell PowerVault MD3420 with 24 drives containing data.It has two 12G-SAS-4 controller modules (E02M005). One of these modules started to fail a system error: when powered on, the module goes through a check, reaches the Cache Backup Device, receives the UNKNOWN status, and then goes offline. Switching it online repeats this process.
Currently, the storage system is running on one controller. Fearing that the tests might affect the working controller, I decided to replace the faulty one.
They no longer produce or sell new modules, so I bought a used storage system with two modules instead. Unfortunately, one module is faulty, but the other is perfectly functional, passes all internal tests, and I updated its firmware. Now it's completely identical to the one installed on the working storage system. I couldn't find any RAID settings on it.
Therefore, the question is:
1. After speaking with one of the server hardware suppliers, I was assured that replacing these modules was "as easy as pie." I turned them off, removed them, inserted them, turned them on, and everything worked automatically. Since I've never encountered this before, I'm concerned about the safety of the RAID settings, and indeed the data itself, on the working module of the storage system I'm using. Is it really that simple?
2. Another supplier explained the module replacement by saying that after installing a new module in the working storage system, automatic synchronization must be performed. I didn't find any menus or options related to "automatic synchronization" in the DELL Modular Disk Storage Manager program, only time synchronization. In other words, Not only did I insert it, but I also need to run some kind of synchronization?
If anyone has had this experience, please share it!

Thank you!