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Knowledge Base

vGPU enabled Instant clone desktops are not load balanced correctly (57297)

Last Updated: 10/26/2023Categories: Best PracticesTotal Views: 7071Language:
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Symptoms

Important: We recommend you migrate from Horizon 7 to Horizon 8 as soon as possible. Horizon 8 offers numerous improvements in performance, scale, and experience for both Administrators and end users. Please see Ensuring a successful migration from Horizon 7 to Horizon 8 (89840)  for additional advice.

Multiple vGPU profiles are supported in Horizon 7 version 7.5 and later. For version 7.5 and 7.6, it is expected to see different behavior for VM placement on the hosts, especially when Best Performance is selected as assignment policy, compared to version 7.4 and earlier.

In versions earlier than 7.5:

If assignment policy is set as Best Performance, VMs are generally spread to different hosts for best load balancing.

In versions 7.5 and 7.6:

If assignment policy of Best Performance is chosen, all VMs with the same vGPU profile will go to the same host till all the slots in all the GPUs on that host are exhausted. This is done in order to accommodate multiple profiles.

Best Performance will try to balance the load between different GPU cards, but only within the same host.

Resolution

To resolve this issue:

Upgrade to Horizon version 7.7

If you have multiple profiles being used, it is highly recommended to set host assignment policy of all GPU hosts within cluster to GPU consolidation.

If you only have a single vGPU profile that is used by all the desktops, you are recommended to set assignment policy of all GPU hosts within a cluster to Best Performance.

OR

If you want to keep your  Horizon version at 7.5 or 7.6:

If you have multiple profiles being used, it is highly recommended to set host assignment policy of all GPU hosts within cluster to GPU consolidation. This will help you accommodate maximum density with multiple vGPU profiles, while still sharing load with different hosts.

If you only have a single vGPU profile that is used by all the desktops, you can get better performance by switching the assignment policy to "Best Performance" and turning on the Max Performance mode. This will help you to spread the VMs on different hosts. For Max Performance mode, see Knowledge Base article How to get better performance for a single vGPU profile for all vGPU desktops.

Related Information

Preparing for NVIDIA GRID vGPU Capabilities for Full-Clone Virtual Machines

Link removed with 2306: https://docs-staging.vmware.com/en/VMware-Horizon/2306/virtual-desktops/GUID-DA309900-0F6D-4BE0-B194-E7442DCFD8BA.html

Removed from GA KB update cycle 2309

Archival with Horizon 7 EOL

Detectable by VMware SkylineTM

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