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Guest VM integration services are a package of virtualization-aware drivers installed on a guest VM. Integration services optimize the guest VM virtual hardware for interaction with the physical host hardware and with external storage.
Microsoft Updates installs VM integration services automatically with Windows Server 2016 Hyper-V and newer.
If you have earlier versions of Hyper-V in your environment, you must install and manually update integration services on VMs. In Hyper-V Manager, use the Action menu to mount the Integration Services Setup Disk (an ISO file). Follow the prompts in the guest VM console to complete the installation.
Windows Server 2016 Hyper-V and newer does not support mounting an integration-services ISO. Use Microsoft Updates to install and update integration services with Hyper-V 2016 and newer.
Verify that integration services update on the VM when you move a VM from an older version of Hyper-V to a newer version.
If a VM does not perform as expected due to CPU, disk I/O, or network performance, verify that the VM integration services are current for the VM.
The presence of unknown devices on a VM indicates a problem with integration services. Verify that integration services are current on a VM if you see unknown devices.
Use tools such as Failover Cluster Manager, PowerShell, or Windows Admin Center to verify the version of integration services.