Storage pools are made up of multiple small allocations of storage called chunks.
Chunk size is an important consideration when creating storage pools. Chunks are established during the creation of the storage pool, with a recommended size range referred to as the guideline chunk size. The guideline chunk size is between 500 MiB and 18 GiB. Each storage pool can contain up to 60,000 chunks.
Larger chunks maximize scalability, while smaller chunks allow more granular file system expansion because a file system always expands by a whole number of chunks.
When creating storage pool using File Administrator, the guideline chunk size is set to 18 GiB (the maximum allowable size).