The Storage Manager is currently available in the (beta) Amazon EC2 ClearOS Professional builds, but the app can be installed and implemented on any ClearOS system. If you want to start using the Storage Manager on an existing ClearOS system, the following technical guide walks through the details:
Storage Manager Technical Guide
If you have any questions or run into any problems, please feel free to post a message in the forums or contact technical support if you have a ClearCenter support subscription.