Upgrade ESX 3.5 to 4.0 with Upgrade Manager
- Backup VirtualCenter Server database just to be safe.
- Perform an upgrade from VirtualCenter Server 2.5 to vCenter Server 4.0
- Download latest ESX 4.x update .iso from VMware. You will need your license account to login
- Login to vSphere client and enable the Upgrade Manager
- Browse to the Upgrade Manager tab
- Click on Admin View -> Download the patches from VMware through Upgrade Manager
- Exit Admin view
- Click on “Attach …” and create a baseline with the .iso you downloaded. Finish the install instructions.
- Create a Baseline group
- Select “Scan …” NOTE: Non-compliant means the ESX host or virtual machine is unpatched or out of date
- Make sure the host is in maintenance mode and there are no running virtual machines on it
- Select “Remediate …”
- Choose to update to upgrade to 4.0
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