Storage pool is aggregation of storage devices for easy disk management and provides various data services: data protection RAID, compression, deduplication etc.

Volume Group (VG)

The basic storage pool is the LVM2 volume group, which provides

Volume Striping (useful only on top of RAID)

Thin provisioning

Dynamic volume resizing

Raid Protection (raid1, raid6) when combined with RaidGroup

Deduplication when combined with KVDO module

Snapshot when used with thinpool

ZFS Storage Pool (ZPOOL)

Advanced storage pool that is transaction oriented for providing always consistent on-disk sate. Data is managed using copy on write semantics (COW)  i.e data is never overwritten.  This combination means that file system can never be corrupted through accidental loss of power or a system crash.

Checksums and Self-Healing Data

Unparalled Scalability with 128-bit file system, allowing for 256 quadrillion zettabytes of storage.

Unlimited snapshots that can be created quickly and easily without any significant performance impact.

Built for simplified administration