There appears to be significant differences on various websites and blogs on the proper way to perform this upgrade. I ran across several variations of command lines etc.
I was able to complete an upgrade from 4.0.0,294855 to 4.1.0,260247using the following process:
- Download the ESXi 4.0 to 4.1 Upgrade package to c:\vmware
- Shutdown all guests
- Put host into maintenance mode
- Run the following command line:
C:\Program Files\VMware\VMware vSphere CLI\bin>vihostupdate.pl –server <hostname> -i -b c:\vmware\upgrade-from-ESXi4.0-to-4.1.0-0.0.260247-release.zip
A username and password with root level access to the ESXi host will be prompted for. After several minutes the following message will appear:
The update completed successfully, but the system needs to be rebooted for the changes to be effective.
Reboot and remove the host from maintenance mode.
Note that command line is found on page 63 of the vSphere Upgrade Guide which can be found here vSphere Upgrade Guide
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