You use Enhanced Storage to manage large numbers of disks and the data on those disks. Although there are many ways to use Enhanced Storage, most tasks include:
Increasing storage capacity, for example, by pooling several physical disks into a single volume (or metadevice) for use as a single unit
Increasing data availability, for example, by using additional disks to provide redundant storage.
You can combine different kinds of volumes to meet one or both of these goals, as well as to improve I/O performance or system reboot time.