If you are concerned over the VM Hardware Version for your vSphere 5.5 environment, you can change the setting that configures each new virtual machine with VM hardware version 10 as a default, this setting is controlled at the data center level. For those wondering why; virtual machines using VM hardware version 10 can only be edited via the web client or command line, you cannot change the settings for those VMs via the C# client.
- To change the default VM hardware version do the following:
- Log into the vSphere web client
- Click on Hosts and Clusters.
- Right click the data center and select Edit Default VM Compatibility…
- Use the Compatible with: pull down and change the setting to ESXi 5.1 and later which will use VM hardware version 9.
Now, any new VMs created will use VM hardware version 9 by default. Note, however, that features and configuration maximums that require hardware version 10 will not be available to those VMs, such as vSphere Flash Read Cache (vFRC).