R210 II does not support Windows Server 2019 operating system. Windows 2012 is the latest windows operating system supported on R210 II. You can refer below link for details on operating system supported on various Dell PowerEdge servers. [URL] You are hitting this issue as 2019 is not a supported operating system for R201 II and it will not have required drivers to detect storage controller on the server.
Service Tag: deleted - Hello. I'm trying to update this machine with a new version of Windows Server. When I get to the set-up screen, a message pops up telling me that it can't find the correct drivers. I'm trying to install the OS with a bootable flash drive.
Windows Server 2019 Installation Trouble