TrueNAS ZFS 8-Drive RAIDZ2 Storage Capacity Calculator (TB to TiB) | OmniCalc Pro
Simulate an 8-drive TrueNAS SCALE ZFS RAIDZ2 vdev: see raw TB, real binary TiB, dual-parity overhead, and the 80% CoW performance threshold.
8-Drive RAIDZ2 VDEV Sizing Breakdown
An 8 Γ 12TB RAIDZ2 array (96 TB raw) dedicates 2 drives to parity, delivering 72.00 TB (65.48 TiB real OS capacity) and surviving any 2 simultaneous disk failures without data loss.