Updates to DRS group members will likely occur much more often than the initial creation of a DRS group in vSphere. Because of this, creating a function to easily manage and update the members of a DRS group is helpful. In this recipe, you will create two functions that are used to update VM DRS groups and Host DRS groups.

In writing the function, you will begin to take into consideration the type of data that can be passed into the function from your users. This is important to consider, because as you've seen, there can be multiple ways to signify a particular object in PowerCLI that all points back to the same virtual machine. You can have string data, you can pass in a virtual machine object, a MoRef, or a View. All of these are valid representations of a virtual machine. The same is true for other elements in vSphere, such as virtual hosts, datastores, and networking.

To begin writing the function, you will pull back some of...