A storage pool aggregates many physical disks into one large storage space. Disks are joined together using RAID technology to form a RAID group. Storage pools may contain more than one RAID group. Using a storage pool provides the following benefits:
Multiple volumes can be created on a storage pool, enabling you to divide the storage space among different users and applications.
Disks of different sizes and types can be mixed into one large storage space.
Disks from connected expansion units can be mixed with disks in the NAS to form a storage pool.
Extra disks can be added while the storage pool is in use, increasing storage capacity without interrupting services.
Qtier provides auto-tiering when a storage pool contains a mix of SATA, SAS, and SSD disks. Qtier automatically moves frequently accessed hot data to the faster SSDs, and infrequently accessed cold data to the slower disks.
Snapshots can only be used with storage pools. Snapshots record the state of the data on a volume or LUN at a specific point in time. Data can then be restored to that time if it is accidentally modified or deleted.
Multiple RAID 5 or RAID 6 can be striped together to form a RAID 50 or RAID 60 pool.