Returning back to the task of building a host and VM DRS groups, the MoRef in the previous recipe will be used extensively. The groups and their memberships will be created using object views, configuration specifications, and the MoRef of each VM that belongs to the group.

You might be wondering why should you create or maintain these types of groups from PowerCLI instead of through the GUI, if there aren't native cmdlets available to you. In PowerCLI, it is easy to assemble a group of objects in an object that meets the specific criteria. This is something you've been doing all throughout the book. You can take criteria such as "all VMs on datastores from storage array X" and easily search for them with the Get-DatastoreCluster, Get-Datastore, and Get-VM cmdlets. Once you have that list, you can update the DRS group to match. PowerCLI actually makes much more sense to update DRS groups through the native vCenter Client method.

The vCenter Client doesn...