RAID type - Supported RAID levels are:

Mirror (two-way mirror - RAID1 / RAID10 equivalent);
RAID-Z1 (single parity with variable stripe width);
RAID-Z2 (double parity with variable stripe width);
RAID-Z3 (triple parity with variable stripe width).
Drive capacity - we expect this number to be in gigabytes (powers of 10), in-line with the way disk capacity is marked by the manufacturers. This number will be converted to tebibytes (powers of 2). The results will be presented in both tebibytes (TiB) and terabytes (TB). Note: 1 TB = 1000 GB = 1000000000000 B and 1 TiB = 1024 GiB = 1099511627776 B

Single drive cost - monetary cost/price of a single drive; used to calculate the Total cost and the Cost per TiB. The parameter is optional and has no impact on capacity calculations.

Number of RAID groups - the number of top-level vdevs in the pool.

Number of drives per RAID group - the number of drives per vdev.