In this post, we explore how to identify and fix quorum loss in a Windows Failover Cluster that includes an SQL Availability Group, running on VMware. This guide provides practical steps for resolving common issues, ensuring stability in your clustered environment.
Prerequisites
Ensure you have administrative access to the cluster nodes and a basic understanding of Windows Failover Clustering, SQL Server setup, and VMware environment. Familiarize yourself with key cmdlets like Get-Cluster and Test-Cluster.
Environment Setup
Verify all nodes are correctly configured in VMware and that they communicate over a reliable network. Confirm that VMware tools on the nodes are up to date to avoid compatibility issues.
Initial Diagnostics
Start diagnostics by checking the cluster nodes’ health and their network connectivity. Execute:
Get-Cluster
Test-Cluster -Node dhsqla, dhsqlb
Network Configuration Check
Verify network configurations and resolve any issues. Pay attention to connectivity and adapter status. Run:
Get-NetAdapter
Quorum Configuration Validation
Check the quorum resource settings. Ensure the configuration supports the network. Execute:
Get-ClusterQuorum
Get-ClusterResource
Testing and Validation
After making network adjustments, re-test the cluster health. Validate all nodes join and maintain quorum.
Common Failures and Troubleshooting
Issues may include misconfigured firewalls or insufficient permissions. Check logs for errors and re-assess network connections.
Cleanup
Document the changes made and ensure continual monitoring of the cluster for early detection of issues.
Sources
Learn more from discussions and resources, such as this Reddit thread.
Transparency note: This guide was created with AI assistance and source verification via automated tools.