RAID planner

Problem

Input: number of disks n, disk size (TB), random IOPS per disk, read fraction; then RAID levels (RAID0, RAID1 as an n-way mirror, RAID5, RAID6, RAID10).

For each level compute usable capacity, failures tolerated (0 disks, n-1 disks, 1 disk, 2 disks, 1 per pair), write penalty (1, n, 4, 6, 2) and effective IOPS = n × IOPS / (read + (1 − read) × penalty).

Print the header level usable tolerates write-penalty effective-IOPS and one line per level with the format %-7s %6.1f TB %-10s %13d %14.0f.

Your solution

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