TrueNAS ZFS 4-Drive RAIDZ1 vs RAIDZ2 Usable Capacity Calculator | OmniCalc Pro
Calculate exact usable TB and binary TiB capacity for a 4-drive NAS array (4x4TB, 4x8TB, 4x16TB) in TrueNAS ZFS RAIDZ1, RAIDZ2, and RAID 10.
4-Drive NAS Array: RAIDZ1 (3 Drives Usable) vs RAIDZ2 / RAID 10
With 4 Γ 8TB NAS drives (32 TB raw) in RAIDZ1 (RAID 5), you get 24.00 TB nominal (21.83 TiB real binary space) and protection against 1 drive failure, with a recommended ZFS 80% safe fill limit of 17.46 TiB.