Rob van My digital life


VMware: Upgrade vSphere ESXi 4.0 to 4.1 using the vCLI

Today I performed an upgrade of VMware vSphere 4.0 to 4.1. Below the steps I've taken to complete this task;

  1. First download and install the vSphere vCLI from
  2. Download the upgrade zip from VMware: Upgrade package for 4.0 to 4.1 or Upgrade package for 3.5 to 4.1
  3. Connect to the host using the vSphere client, stop or suspend any VMs, and enter maintenance mode
  4. Open a command window and change directory to the vCLI bin folder (default: CProgram FilesVMwareVMware vSphere CLIbin)
  5. Execute the following 2 steps to upgrade the host;
    1. --server [hostip] -i -b [path to updateupdate-file-name] -B ESXi410-GA-esxupdate
    2. --server [hostip] -i -b [path to updateupdate-file-name] -B ESXi410-GA
  6. After the upgrade you can check for the installed updates using the command " --server [hostip] --query"
  7. If the upgrade went successful you must restart the host en exit maintenance mode.

Here is a screenshot the upgrade process;

When you are connected to the host with the vSphere client during the upgrade you can monitor the actions in the Task section;


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VMware: ESXi 4.1 password check bug

Today I copied and pasted my VMware ESXi root password to the vSphere client password box and hit enter to login. When I looked back at notepad I saw I didn’t copy all the characters of the password. So the password I pasted into the vSphere client was not correct.

After some research (Google... 🙂 ) I found out this is a known issue on ESXi 4.1. If you have a password with >8 characters only the first 8 will be checked during login. So if you password is for example vmware1234567 you can successfully login with the password vmware12 or vmware1209876.

A workaround for this issue is described at VMware KB artikel 1025400, a permanent fix is not yet released.