Unstable environment when attempting to set up VCHA using WAN

Products

• VMware vCenter Server

Issue/Introduction

The vCenter Server environment becomes unstable during the setup of vCenter High Availability (VCHA). Symptoms include:

• The appliance state is out of sync.
• Frequent failovers and network isolations occur.

Cause

This issue occurs because WAN connections are not supported for VCHA. VCHA requires a dedicated, high-fidelity, low-latency network to maintain synchronization and stability between nodes.

Resolution

To resolve this issue, use a wired LAN network for the VCHA deployment. For detailed deployment requirements, refer to the following resources:

• vCenter Server High Availability Documentation
• Deploying vCenter High Availability with network addresses in separate subnets
• FAQ: vCenter High Availability