Enterprise Storage Engineering Tool
ZFS & RAID Storage Sizing Calculator
Planning a TrueNAS pool, Synology expansion, or high-density Ceph/ZFS cluster? Calculate real usable capacity, drive failure tolerance, parity overhead, and $/TB before ordering hardware.
24-Bay Hot-Swap SAS/SATA JBOD Simulation Ready
ZFS & RAID Engine Live Array Sizing
Storage Array & $/TB Calculator
Calculate usable capacity, parity protection, and cost per TB across ZFS pools & hardware RAID.
1. Drive Capacity (TB)
8 Drives
4 bays8 bays16 bays24 bays (4U JBOD)48 bays
3. RAID / Array Configuration
$
Array Calculation OutputSurvives: 2 simultaneous drive failures
Usable Storage
108 TB
≈ 98.2 TiB in OS / ZFS
Cost per Usable TB
$14.00
$10.50/TB raw
Storage Utilization Breakdown75% Usable
Usable: 108TBParity Protection: 36TBRaw Total: 144TB
Total Hardware Investment:$1,512
8 × 18TB @ $189
Configuration Note:Most popular choice for 4-bay to 12-bay TrueNAS and ZFS builds.
RAID & ZFS Architecture Cheat Sheet
How enterprise parity algorithms behave on modern high-capacity drives (12TB to 24TB+).
| RAID Level | Min Drives | Usable Space | Fault Tolerance | Best Used For | Rebuild Risk |
|---|---|---|---|---|---|
| RAID 0 | 2 | 100% (N × Size) | 0 drives | Scratch disks, non-critical cache | High |
| RAID 1 / ZFS Mirror | 2 | 50% (1 × Size) | 1 drive per pair | OS drives, high-IOPS databases | Low |
| RAID 5 / RAIDZ1 | 3 | (N - 1) × Size | 1 drive | Small arrays (<8TB drives) | High (>8TB) |
| RAID 6 / RAIDZ2 (Recommended) | 4 | (N - 2) × Size | 2 drives | TrueNAS, Synology, enterprise storage | Low |
| RAID 10 | 4 | 50% (N/2 × Size) | 1 drive per mirror | Virtual machines, fast rebuilds | Low |
| ZFS RAIDZ3 | 5 | (N - 3) × Size | 3 drives | Massive JBODs (24 to 60 bays) | Very Low |