How Can I Fix My Windows Server 2022 with Hardware Reserved Memory Issues?

Honestly, the fact that you don’t have backups is pretty concerning. I recommend that you set up a backup solution as soon as possible. For now, check if there have been any recent updates applied to the server that could have triggered this issue. Sometimes, recent updates can cause unexpected behavior with memory management. If that’s the case, rolling back the last few updates might help!”},{

This sounds like a classic case of memory allocation issues, especially with Hyper-V and SQL running. Make sure your VMs aren’t hogging all the memory. Shut down your VMs one by one to see if the usable RAM increases. Ideally, you should configure the memory allocation for your VMs to ensure that there’s always enough left for the OS. Also, check SQL’s max memory settings and adjust them accordingly.

First things first, you should consider checking your BIOS settings. Make sure the 'Memory Remap Feature' is enabled, and try to reset the BIOS to default settings. After any changes, don’t forget to restart the server! If that doesn’t work, try disabling any BitLocker protection, reseating the RAM, or even removing half of it temporarily to see if the memory issue changes. Ultimately, booting into a live Linux distro to check if it recognizes the RAM correctly might shed some light too.