Upgrading an ESXi 4.0 server to 4.1

I found the following blog article particularly useful in documenting the steps to upgrade an ESXi 4.0 server to 4.1.

I’d already downloaded upgrade-from-ESXi4.0-to-4.1.0-0.0.260247-release.zip to my vCenter server.  I’d also downloaded and installed VCLI 4.1 on the vCenter server too from here.   The following applicable steps in the article above.

  • Power off your VM’s and put the host into maintenance mode
  • Change your current directory to C:\Program Files\VMware\VMware vSphere CLI\bin
  • From the vSphere CLI prompt
  • vihostupdate.pl –server host name or IP address -i -b location of the ESXi upgrade ZIP bundle -B ESXi410-GA
  • So in my case (don’t forget the .pl in vihostupdate.pl)C:\Program Files (x86)\VMware\VMware vSphere CLI\bin>vihostupdate.pl –server esxiblade2 -i -b d:upgrade-from-ESXi4.0-to-4.1.0-0.0.260247-release.zip -B ESXi410-GA

After rebooting the ESXi server it was then running at ESXi 4.1 !