Storage tools for planning arrays before buying drives

Calculate capacity from the drives and topology you actually plan to use. Each tool keeps theoretical capacity, implementation estimates, and observed data separate.

Start with the array layout

RAID Capacity and Level ExplorerCompare conventional RAID capacity, mixed-drive waste, explicit nested groups, and failure boundaries.ZFS Pool Capacity CalculatorModel mixed vdevs, RAIDZ allocation, slop, auxiliary roles, and planning headroom.ZFS Block Size and Padding CalculatorInspect data, parity, and padding per block.RAIDZ Expansion PlannerCompare each one-disk width change.