Introduction
Keeping ESXi hosts and vSphere components current is an important part of infrastructure maintenance. Updates can provide security improvements, bug fixes, hardware compatibility, and new capabilities.
However, upgrades should be carefully planned to minimize operational risk.
INFO
Always validate compatibility and backup critical configuration before starting a major infrastructure update.
1. Review the Current Environment
Before planning an update, document:
- vCenter version.
- ESXi versions.
- Hardware models.
- Firmware versions.
- Installed drivers.
- Cluster configuration.
- Third-party integrations.
This provides a clear starting point for lifecycle planning.
2. Check Compatibility
Verify that the target software version is supported by the existing hardware and integrations.
Review:
- CPU compatibility.
- Server hardware.
- Network adapters.
- Storage controllers.
- Firmware.
- Third-party plugins.
WARNING
Installing a new ESXi version without validating hardware and driver compatibility can result in unavailable devices or unstable hosts.
3. Prepare Backups
Before updating critical infrastructure, confirm that recent backups exist.
Protect:
- vCenter configuration.
- Important virtual machines.
- Network configuration.
- Application data.
- Deployment documentation.
Verify backup status before beginning the maintenance window.
4. Plan the Maintenance Window
Define:
- Start and end time.
- Hosts affected.
- Workloads affected.
- Expected downtime.
- Rollback plan.
- Responsible administrators.
If workloads can be migrated, move them to healthy hosts before placing a host into maintenance mode.
5. Perform the Update
Follow the supported lifecycle process for the environment.
Monitor:
- Host connectivity.
- Installation progress.
- Reboot status.
- Driver loading.
- Datastore access.
- Network connectivity.
Do not interrupt an update unless the supported recovery procedure requires it.
6. Post-Update Validation
After the update, verify:
- ESXi version.
- Host connection.
- Network interfaces.
- Datastores.
- VMkernel services.
- Cluster health.
- HA/DRS status.
Run a basic workload test before returning the host to normal production operations.
Conclusion
A structured lifecycle management process reduces the risks associated with infrastructure updates. Compatibility validation, backups, maintenance planning, controlled deployment, and post-update verification should be part of every VMware maintenance cycle.
