@exelan Welcome to Rockstor.
Re the updates, Rockstor is orientated towards being a appliance so it is expected that one would first choose an update channel as the first Web-UI prompts. After that your experience is likely to be more in line with one that is intended by the developers and so easier to support.
As a starter so we can confirm where you are, could you paste the output of the following command:
yum info rockstor
Although I suspect that it is going to be easier to just re-install using the latest iso and then select your preferred update channel, without this I think your install is taken way back to a time long forgotten (via the -y) and there have simply been too many changes to guarantee a smooth upgrade. Also you might want to be aware of the bump in that upgrade path we recently hit by changing the database migration mechanism:
Which was a bit of a nuisance but the future benefits will out way the legacy issues not changing would have caused.
Yes Rockstor looks after the mounting so your pools and shares should be unaffected.
Pretty sure your current Rockstor package version is now just very old so as you have diagnosed there is a bunch of stuff that no longer makes sense or simply didn’t exist back then.
Hope that helps.