Virtualization: Hyper-V: Virtual Disks Folder Free Space Under 2GB

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Free space less than 2GB on Virtual Disk Folder is considered a warning. To avoid data loss on Hyper-V Server, free disk space should be greater than 2GB.

https://docs.microsoft.com/en-us/previous-versions/system-center/packs/jj871692(v=technet.10)?redirectedfrom=MSDN

Remediation

It is highly recommended that a host machine running Hype-V has free space.

Running out of space on a Hyper-V host could lead to catastrophic issues with virtual machines.