Downgrade VMware ESXi 5.5 Virtual Machine Hardware Version to 9 from 10

 

Scenario 1: You upgraded your VM from hardware version 9 (vmx-09) to 10 and want to roll back to version 9 (vmx-09):

  1. Shut down the virtual machine in the vSphere client.
  2. Remove your virtual machine from the ESXi inventory.
  3. Browse your Datastore and find the virtual machine’s .vmx file.   Download it to your desktop.
  4. Open the .vmx file in Notepad or your favorite text editor.
  5. Find the following line (usually line 3) in your configuration and change the “10” to a “9”
    virtualHW.version = “10” will become virtualHW.version = “9”
  6. Save the file and overwrite your existing .vmx file.
  7. Upload the file to the same location your downloaded the file from in step 3.
  8. Add the machine to inventory and start it up.

Scenario 2: You are on an older VM version and want to upgrade it to 9 using vSphere 5.5:

  1. Shut down the virtual machine in the vSphere client.
  2. Right click your VM and select “Upgrade Virtual Hardware”.  You will now be on version 10 hardware.
  3. Remove your virtual machine from the ESXi inventory.
  4. Browse your Datastore and find the virtual machine’s .vmx file.   Download it to your desktop.
  5. Open the .vmx file in Notepad or your favorite text editor.
  6. Find the following line (usually line 3) in your configuration and change the “10” to a “9”
    virtualHW.version = “10” will become virtualHW.version = “9”
  7. Save the file and overwrite your existing .vmx file.
  8. Upload the file to the same location your downloaded the file from in step 4.
  9. Add the machine to inventory and start it up. 

    There are two additional comments I’d like to make —

    (1) if you log into one of your esxi servers via SSH, you can edit the vmx file directly in the shell by doing the following —

    * cd /vmfs/volumes/{name of your datastore volume}/{name of your virtual machine}
    * vi {name_of_your_vm}.vmx

    (2) Removing the vm from inventory and add it back in. I confirmed this is necessary.

That’s it!  You can now use vSphere 5.5 to manage your hosts just like you did in 5.1 or 5.0.

 

Refer to: http://blog.waldrondigital.com/2014/01/21/how-to-downgrade-vmware-esxi-5-5-virtual-machine-hardware-version-to-9-from-10/

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