A "Provisioning" network is not configured on the source or destination host. This can lead to lower network copy throughput.

Products

• VMware vCenter Server 8.0
• VMware vSphere ESXi 8.0

Issue/Introduction

During Compute and Storage vMotion on vSphere 8.0U3, we receive the below given warning in the Compatibility tab of the Migration task:

A "Provisioning" network is not configured on the source or destination host. This can lead to lower network copy throughput.

Environment

vSphere 8.0U3

Cause

When performing a Compute and Storage vMotion, the live-migration uses the vMotion enabled vmkernel adapter whereas the cold data(storage) during a vMotion is transferred using the Provisioning network if it's configured, or the Management network when the Provisioning network is not configured.

Resolution

With vSphere 8 a feature called UDT (Universal Data Transport) was introduced. In a nutshell, UDT combines the best of the NFC and vSphere vMotion protocols. It enhances cold migration by using NFC as a control channel but offloads the data transfer to vSphere vMotion protocol. The transfer of files using the vMotion protocol is usually by magnitudes faster than the classic NFC, which is single-threaded.

To start using UDT, all we need to do is activate the provisioning service on the existing vmkernel interface that is configured for vSphere vMotion. After implementing this change, the warning will no longer appear during migration.

This warning can be safely ignored as well and the data traffic passes through the Management 

Additional Information

Please find the below given document for more details on UDT:
vSphere vMotion Unified Data Transport

vSphere 8 Enhancements for VM Cold Migrations, vMotion, and Cloning