I'm running into an issue with setting up my unRAID server. I'm using my old gaming computer to use as a fairly large NAS and VM Host. I have 32 GB installed in the system but unRAID is only allocating ~16GB of ram (see screenshot below). This is preventing me from being able to allocate 16GB to a Virtual that made to use as a game server. I am currently running the Trial version so I don't know if this is a memory limitation of that, but I couldn't find that documented anywhere. (I just want to make sure everything works before purchasing)

 

 

And here's my other specs for reference:

MoBo: MSI FX990A-GD65

CPU: AMD FX-8350

Memory: 4x 8GB DDR3

GPU: GTX 780ti

 

If anyone has any ideas of what is happening or how I can fix this it would be greatly appreciated.

 

What SAS/SATA card are you using? Do you see the correct amount of memory if you remove it? There's a strange problem that can cause half your memory to be ignored if you have all four slots filled. The remedy is to mask off two pins on the PCIe connector. See here: https://lime-technology.com/forum/index.php?topic=12767.msg159603#msg159603

I'm currently only using the onboard SATA controller. I'm bookmarking that link incase that happens when I do get one though. Thanks.

A few thoughts:

 

Ignoring unRAID for a moment, how much RAM does the BIOS see? Have your tried removing one pair of DIMMs, then the other pair? Is the RAM you're using on the qualified list for that motherboard? Are you trying to overclock? If it's an old gaming computer, you may have some BIOS settings that are undesirable for a server. Have you run memtest?

 

I got it working. TL;DR reseating the ram fixed it.

 

The BIOS was previously seeing the full 32GB and memtest passed on the full 32GB. I factory reset the bios as there was some overclock setting still in there, still didn't work. I reseated the one and removed 3 of the sticks to see if unRAID would only report 4 of 8. It saw 8/8, second stick 16/16, 3 sticks was 24/24, and adding the 4th finally showed the full 32. I really didn't think that would be the problem because I haven't touched that moboard since I had my windows installed on it which was working with the full 32GB, but I can't argue with results.

 

Thanks for the help!

This worked for me as well, my Unraid was showing 64 .

But when I ran free in terminal I only saw 32. So from this post I turned off the server, removed all but one stick of ram. Turned on the server checked RAM. Repeated until I had reseated all my RAM and free now showed 64g. This issue seemed to related to a vm install. 

Thanks @necrobard for this post!