Amazing, thanks ryecoaaron. I was unable to install the latest OMV update ( 7.3.0-4 ) on my XU4 due to this problem and was tearing my hair out. Everytime I would try to update via apt it would fail, then tell me to run: "dpkg --configure -a". When I ran that command, dpkg would freeze at "Setting up salt-minion" every time and require a power cycle. Took me a while to realise that it was probably something specific to my arm based board. It was only then that I was able to change my searches and find this thread. The board now runs extremely fast! Even just logging in via SSH was taking a long time. I just assumed that it was because it was old and a bit outdated.
For the record, I ran the following commands:
sudo omv-env set "OMV_CPUFREQUTILS_MINSPEED" "200000"
sudo omv-env set "OMV_CPUFREQUTILS_MAXSPEED" "2000000"
sudo omv-env set "OMV_CPUFREQUTILS_GOVERNOR" "performance"
sudo omv-salt stage run prepare
sudo omv-salt deploy run cpufrequtils