Plex Media Server drives not being found after a while

Plex Media Server Desktops & Laptops
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Server Version#: latest
Player Version#: latest

So just recently I bought a new desktop computer to use for my media server and Pi-Hole as my other desktop was a little sluggish. I decided that this time I wanted to install Ubuntu and run my Plex server there along with my Pi-Hole. First I ran into the error of Plex not finding my external HDDs which I found a tutorial on here and followed step by step. So I got that working I thought everything would work fine after adding my HDDs. Well I was wrong, the problem I’m having is if I leave my media server inactive for a while (say overnight) the HDDs get unmounted from my system for some odd reason. They’re still powered on but not mounted. The problem still occurs if I unplug and replug them back in. By this happening Plex reports that my media is unavailable and cannot be used. If anyone can help me that would be awesome, I’ve tried reinstalling Ubuntu from scratch many many times thinking that was the case but it wasn’t. Also, my other computer seemed to work just fine and I didn’t have to do anything crazy to it, so I’m not sure why my new desktop is having issues. Another thing is I’m using a USB hub that has 4 ports that I’m able to plug each of my HDDs into. Again any help is greatly appreciated and hopefully this can be solved.

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If the drives sleep and don’t wake up in time when PMS starts a scan (which it shouldn’t unless you have “Periodically scan” enabled, PMS will mark them as unavailable (knowing the drive is offline) instead of removing all the media from your library.

What you need determine is how/why they are going offline and not waking in time.
It could be the hub (not all hubs are the same) or be a setting under Devices.

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I have checked under devices to see if there was something I could change for the USBs going to sleep but there wasn’t anything for Ubuntu 19.10. I have another USB hub I could try to see if that does anything. And when I get the chance as I’m at work I’ll see if I can see if that setting is enabled which it shouldn’t be as you mentioned.

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So I decided to take the external HDDs out of the hub and just plug them straight into the computer itself. Turns out they don’t mount to their respective points as directed within the fstab file. I have to reboot for them to mount correctly again. It seems like the devices aren’t in fact sleeping but something is preventing them from mounting the right way. What do you think?

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