I have installed OMV on a rapberry pi 3B+, and the ethernet connections doesn't work. I reinstalled three times, reset my router, my raspi... and nothing works. I try to make a static IP with commands but it doesn't work. I don't know can i do.
try setting the network with nmtui. it worked for me
I try it but i don't have internet connetction yet
if you've downloaded the OMV raspberry pi image of sourceforge, the OS is armbian.
Use the config tool on the commandline: armbian-config
There you can set the IP.
Another way to do it: assign the IP address in the DHCP server of your router, by MAC address.
You'll have to reboot the raspberry pi (maybe even multiple times), before it picks up the new IP.