Windows Hyper-V ran out of memory

I have a Windows 2016 Hyper-V machine that holds a Linux VM. The link VM is running at 12GB RAM and I want to increase that. When I try to increase it is says it ran out of memory.

1. There is 12 GB Free on server
2. All windows updates are installed

3. I can create another VM with 6 GB of RAM and it starts up fine; I just can't add it to this VM. I can't even add 2 GB to the VM in question.

4. Numa is off.

5. Guest Services is installed.

Any suggestions? I have read countless forums but can not resolve the issue.

Thank you.

Solution 1:

Check the NUMA spanning in Hyper-V settings. Looks like you tried to assign more RAM memory that you have on a single NUMA. By enabling this option you will be able to assign more memory to the VM! https://www.starwindsoftware.com/blog/a-closer-look-at-numa-spanning-and-virtual-numa-settings