Hello. As a long time basic nas user my mind has recently been opened and am now building a machine for unRAID and I wanted to see if there was anything majorly wrong before I pull the pin. 
 

Usage for the machine will be: 2x sonarr, 2x radarr, overseerr, flaresolverr, prowlarr, qbittorrent, sabnzbd, and Plex with hardware transcoding for 4k for about 6 users being able to transcode video and audio +subtitles remotely and myself locally. 
 

I want the machine to be able to stream to all of my users while also having them be able to interact with overseer without it being slow, and for sabnzbd to be able to download while unpacking without pausing to process, all simultaneously. 
 

The idea for the setup is that 1x name ssd will house the containers, 1x nvme ssd will be used purely for downloading/unpacking by sabnzbd, and the the arr’s will move the completed files to the drive pool, which I’m hoping to set up as raid5 and be able to expand as I get more drives up to a max of 16 hdds. My main priority is speed, I want the users to go from requesting a movie to watching it in minutes. There is a third nvme slot on the MB if it might help to use that as well 
 

The pc part picker list doesn’t have the ram as it wasn’t there. But it’s 64gb 3200 ddr4. And it also didn’t have the lsi sas card I found either, was thinking two of these would do the trick?

https://www.aliexpress.com/item/1005006831663542.html?_randl_currency=AUD&_randl_shipto=AU&src=google

 

https://pcpartpicker.com/list/mVK94M

 

Any feedback or recommendations are welcome and appreciated 😁

The drawback of the mobo was 2 16x slot was x1 PCIe lane only, if you won't adding bandwidth demand device then it is not a problem.

16 minutes ago, Vr2Io said:

The drawback of the mobo was 2 16x slot was x1 PCIe lane only, if you won't adding bandwidth demand device then it is not a problem.

Yeh I did notice that. Future bandwidth isn’t an issue, 2.5g is fine. But as a result I changed the sas to a single 9300-16l