CLI migration from N-VDS to VDS doesn't complete and leave ESXi hosts in Maintenance Mode

Products

• VMware NSX

Issue/Introduction

• You are attempting to use the CLI to migrate a cluster from N-VDS to VDS.
• All or multiple ESXi hosts are entering, or attempting to enter Maintenance Mode at the same time.
• The migration fails without an error code, but lists the nodes un "Transport-Nodes Migrate Failed".

Environment

VMware NSX-T Data Center 3.x

Resolution

This is a condition that may occur in a VMware NSX environment.

Workaround:

• You may cancel pending tasks trying to set too many ESXi hosts to Maintenance Mode.
• Instead of performing the migration at cluster, opt for one host at a time.
• Refer to the NSX Documentation page for API, CLI or UI methods: Migrate Host Switch to vSphere Distributed Switch