Hotplug Memory Reporting Mismatch in Windows Guest OS

Problem

• When configuring Hotplug memory in a VM, the memory reported inside the Windows VM shows the maximum hotplug range instead of the configured hotplug memory value.
• Example: With Hotplug RAM = 8 GB and Max Hotplug RAM = 64 GB, the Windows VM reports 64 GB instead of 8 GB.

Environment

• Private Cloud Director Virtualization - v2025.4 and Higher
• Self-Hosted Private Cloud Director Virtualization - v2025.4 and Higher

Cause

This is a reporting mismatch inside Windows guests when the configured Hotplug RAM is less than the Max Hotplug RAM.

• The VM is presented with the maximum hotplug range, which Windows reports as total memory.
• Actual usable memory remains aligned to the configured hotplug value, but may not be correctly displayed in Windows Resource Manager.

Resolution

• In some cases, performing a VM reboot may help the guest OS reflect the correct usable memory.
• If the issue persists, a practical workaround is to configure the VM with Hotplug RAM = Max Hotplug RAM so that Windows reports the expected value.

Additional Information

This behavior is currently under review by the engineering team and is being tracked under reference PCD-2855. You may reach out to Support quoting this reference for the latest updates on the fix.