Dear Axe,
Have a good day.
The minimum unit for the capacity of a storage pool is GB. The size of a storage pool must be an integral multiple of the chunk group (CKG) size, which depends on the RAID level and the customers' configuration. For example, the CKG size of RAID 5-9 (RAID 6-10) is 512 MB, while that of RAID 10-4 is 128 MB. The minimum unit GB defined for the storage pool size can meet the configuration requirements for all RAID levels. The following figure shows the Create Storage Pool page.

Thanks.