Auto LUN is used to optimize your data storage by balancing resource utilization and resolving bottlenecks of system activity on the storage system. If heavy input/output (I/O) activity occurs on a specific hard disk drive or disk processor, the host might suffer from slower response times. To avoid this situation, Auto LUN lets you migrate high-usage volumes to a low-usage hard disk drive or a fast hard disk drive. Migrating volumes with Auto LUN is completely non-disruptive as the data being migrated can remain online to all hosts for read and write operations throughout the entire migration process. Auto LUN operations can be performed manually or set up to run automatically at specified times. In manual migration, the system administrator specifies the source volume and the target volume, and then executes the manual migration plan. In an “Auto” migration, the Auto LUN software determines source and target parity groups based on Auto Plan settings and executes the migration plan automatically at a specified interval and time.