I'm relatively new to Unraid and currently in the midst of upgrading my drives. I've already replaced my parity disk and allowed it to rebuild successfully. However, when I attempted to replace disk one with a larger drive and started the array for the rebuild process, it displays "Starting array. Mounting drives," but it never completes the mounting process. I attempted to reinstall the old disk, but it was rejected because it's smaller than the new drive. Furthermore, it appears that the Stop button isn't functioning properly. When I attempt to stop the array, nothing happens, forcing me to reboot each time. I'm kinda stuck and don't know how to proceed. 

tower-diagnostics-20240408-2329.zip

Looking through the diagnostics it seems the parity1 drive has gone offline and as a result there is no SMART information for it.   You might want to check the power/cabling to the drive.