The storage pool is aggregation of storage devices for providing 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 with COW

Volume Striping

Unlimited snapshots