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Storage aggregates and disks

A storage aggregate is a logical grouping of physical storage that is protected by RAID technology. When you create a storage aggregate, you specify the number of disks in the underlying RAID set and the level of RAID protection for the set (RAID-4 or RAID-DP).

A storage aggregate contains a defined amount of physical storage that can be expanded dynamically at any time. For example, if a storage aggregate is made up of three disks, an additional disk can be easily added to the storage aggregate, and the logical size of the storage aggregate can be increased accordingly, without disrupting any user or process currently using that storage aggregate. Storage aggregates can include hot spare disks that hold data if one of the other disks fails.