Note: We are going to be upgrading our ESXi 4 Update 2 Host to ESXi 4.1 using vCenter Update Manager. You must already have Update Manager installed before continuing, it is also essential to download the host upgrade file upgrade-from-ESXi4.0-to-4.1.0-0.0.260247-release.zip from vmware’s website by clicking here
The process of upgrading VMware ESXi 4 to ESXi 4.1 with vCenter Update Manager is exactly the same as the ESX upgrade procedure to ESX 4.1. Please click here to review that tutorial.
All the tutorials included on this site are performed in a lab environment to simulate a real world production scenario. As everything is done to provide the most accurate steps to date, we take no responsibility if you implement any of these steps in a production environment.