Did you upgrade omv2 -> omv3 through the terminal?
If yes, despite the fact now seems everything ok, I would suggest you to start from scratch, and just install omv3 from fresh install not upgrade.
The reason for that, is debian (the distro under the hood for omv) changed to systemd, that's a huge change for the distro and I found out that at the beginning everything seemed fine, after a couple of weeks, I was encountering a lot of issues, so my suggestion for you, would be just go ahead and install omv3 from scratch instead and you will have no problems.
Yep I saw that was solved, I just wanted to advise you, that upgrading omv2 -> omv3 through ssh is not a really good advise, but if you are experienced with arch you probably are aswell on the breaking\fixing thing of side good luck then 
Arch is not complicated.
Two years on Arch and nothing broken.
Upgrading to OMV 3 trough SSH is not the better way. And install from scratch is the best way I understand it.
But upgrading is not so dangerous. I am not the only one who succeed in. There is some configuration tips and it runs.
The most difficult for me is to say those things in English. 
haha don't worry it's ok
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