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The benefit of using a volume manager is that an administrator can allocate space for specific applications or data, and move volumes as he/she wishes, typically with no downtime. This can help with storage performance and capacity planning.
Because storage administrators can partition the capacity of disk drives on an array and pool them as they wish, volume management can be considered a form of storage virtualization. Examples of popular commercial volume managers currently on the market include Hitachi Universal Volume Manager, Linux Logical Volume Manager and Veritas Volume Manager.