Pipepito

I have 2 800S running, one of them full, the other with 7 drives atm. No issues other than what I commented on my previous post about the drives not turning on correctly after a reboot/turn on on my server, since I didn't had the chance to upgrade my HW yet... I've gone with... the smart plug solution! So right now, no apparent issues, if my server gets shut down or rebooted I just turn off the 2 plugs, wait until Unraid is up, and once its up I just turn on both cases (1 at a time), then start the array. I have a Rpi4 set to automate all this process in case I want it automated, but too lazy to fully set it up lately

Might be an issue with my motherboard, that's been on my mind for ages, but since the HW where I'm running my system fell into my lap...have to get most of it, even if it means having the same issue as you (no array, no services) To expand a bit, my server is a Dell Precision Tower T7910, in the MB there are several PCIe slots, flagged with different wattage, I have the GPU using one of them flagged as 225w, the controllers are in the ones flagged as 75W. SO MY PROBLEM IS MOST LIKELY THERE I have also pending to test a "temporary solution" which would be see how it reacts if I turn it off and turn it on again (the D800S) using a smartplug once the server is up, but tbh this option scares me a bit. My plan in the future is replace my desktop Ryzen 3700 with a 5900x and move my unraid setup into it, so that's why I didn't give it much thought to the disks issue. Worst case scenario I'm out of Plex until I'm back, but I understand that there's people running more critical stuff than me. Anyway, the main thing is that Unraid supports and detects the expansion unit without issues

Yes, I have 2 D800S on my server and the "only" issue I encountered is that not every disk spins up on startup, which makes me take it out and put it back in again, other than that the units run fine