Event ID - 3221

Event Id3221
SourceMicrosoft-Windows-Hyper-V-Worker
DescriptionUnable to save RAM contents at address %3.
Event InformationAccording to Microsoft :
Cause :
This event is logged when unable to save RAM contents at address.
Resolution :
Save state
Investigate the environment in which the virtual machine operation was attempted, including:
1.access and permissions to the configuration file, memory file and all image files
2.prior error messages in the event log
3.available RAM on the system
4.configuration settings.
5.disk space for the memory file and any expanding virtual hard disks
6.access and permissions to the saved state file
Once the necessary issues have been rectified, try to save state again.
Verify :
The virtual machine is able to save successfully.
Reference LinksEvent ID 3221 from Microsoft-Windows-Hyper-V-Worker

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