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Persistent disk or user data disk

The persistent disk feature of View Composer allows you to configure a separate disk that contains just the user data and user settings and not the operating system. This allows any user data to be preserved when you update or make changes to the operating system disk, such as a recompose action.

It's worth noting that the persistent disk is referenced by the VM name and not the username, so bear this in mind if you want to attach the disk to a different VM.

The data disk is also used to store the end user's profile. You, therefore, need to size it accordingly, ensuring that it is large enough to store any user profile type data, such as Virtual Desktop Assessments. This is another reason why it's a good idea to run a desktop assessment, as we will cover in Chapter 3, Design and Deployment Considerations, so that you can build up a picture of what your user desktop profiles and user data requirements look like.