storage pool
A storage pool is created to get a very large capacity of GBs/TBs/PBs available, from which users are provided needed amounts of storage
For example, one can combine 10 hard disk drives of 4TB each, totaling to 40TBs. Now, one can either directly use the 40TB as a single device or partition the space out to many smaller storage capacities such as 100GB, 1TB and so on from this 40TB and provide that access to different users.