DRS fails to migrate vGPU enabled VM's automatically

Products

• VMware vCenter Server

Issue/Introduction

Symptoms:

• When placing an ESXi host in maintenance mode DRS may fail to automatically migrate VM's that have vGPU enabled.
• Under a Cluster's Monitor tab the "vSphere DRS" -> "Recommendations" section may have a VM Migration recommendation for vGPU VMs with a Reason "Destination host is selected for fixing policy/rule violation or its healthy state is better".
• Manually migrating vGPU enabled VM's is working as expected.

Environment

VMware vCenter Server 6.7.x

VMware vCenter Server 7.0.x
VMware vCenter Server 8.0.2

Cause

This is expected behavior. DRS supports initial placement of vGPU VMs running vSphere 6.7 Update 1 and later without load balancing support.

Resolution

Starting with vSphere 8.0 U2, DRS can estimate the Stun Time for a given vGPU VM configuration. When the DRS Cluster Advanced Options are set and the Estimated VM Devices Stun Time for a VM is lower than the VM Devices vMotion Stun Time limit, DRS will automate VM migrations.
 
To enable this functionality, make sure the infrastructure meets the following requirements:

• Healthy vSphere Lifecycle Services (see vSphere Cluster Services (vCLS) Known Issues/Corner Cases)
• Configuration of the VM's vGPU devices through the VCenter UI only
• Healthy vMotion network 

Then add the following DRS Cluster Advanced Options:

Option: PassthroughDrsAutomation
Value: 1
 
Option: LBMaxVmotionPerHost
Value: 1

For vGPU VMs with Stun Times exceeding the "vMotion Stun Time Limit" (default 100 seconds), a VI Admin can add the following DRS Cluster Advanced Option:

Option: VmDevicesStunTimeTolerated
Value: <number of seconds, greater than any VM's Estimated Stun Time in the Cluster> (Default 100 seconds)

OR

Modify the "vMotion Stun Time Limit" in the VM's Configuration -> "VM Options" Tab -> "Advanced" Section

For older releases, to resolve the issue please follow the below mentioned points:

• For Maintenance Mode evacuations, please refer vGPU Virtual Machine automated migration for Host Maintenance Mode in a DRS Cluster.
• If VM placement issues arise, reduce "DRS Automation" to "Partially Automated" please refer Configure Virtual Graphics on vSphere for more information.

Workaround:

• To workaround this issue manually migrate vGPU enabled VMs to another host.

Additional Information

For additional information refer Using vMotion to Migrate vGPU Virtual Machines