I have a spare computer at home and I decided to replace my old QNAP so I decided to try several distributions.
At the beginning I tried Truenas which was very easy to install but it’s memory requirements were too much for my hardware (8 GB RAM).
I continued with openmediavault wich has a lovely web interface but after spending a lot of time I couldn’t install plex, so I gave it up.
Then I tried rockstor which is easy enough to install and this is for the time being running on my NAS.
Unfortunately I have two 8GB seagate disks which I can’t put to stand by mode and they are spinning continuously, and that is not what I want. Except that I’m very happy with the way it operates.
Now I am trying to setup an ubuntu server hoping that it will fulfill all my requirements.
I run My plex server on xubuntu. no issues and runs great
Ubuntu server will work fine for this.
“OFFICIALLY” 
- xubuntu isn’t supported (like Mint, Gentoo, and several Ubuntu derivatives).
but it does seem to be decent. Mint isn’t stable enough to run server apps,
I use Ubuntu server on an older Xeon CPU. My drives run constantly. It’s rock solid without issue.
With PMS running, the drives will never sleep unless you set them to 5 minute timeout. That will wear the drives out REALLY fast constantly parking the heads so wouldn’t do it myself.
Hopefully those are 8TB disks and not 1990’s “8GB” disks
From the peanut gallery, I’m running PMS on OpenSuSE Leap, and it’s been solid. I had been running it on CentOS, until BlueBeanie, I mean, RedHat, changed direction on CentOS. Media storage on an NFS mounted Synology NAS volume.
If you haven’t read @ChuckPA’s Linux on Plex docs, that’d be an awfully good thing to do before get too much further down the garden path.
