NAS pSEO Landing
Estimate usable TB, parity overhead, and fault tolerance for 12x 12TB in RAID 10. Includes reserve planning for NAS and homelab arrays.
Raw Capacity
144.00 TB
Usable Capacity
64.80 TB
Fault Tolerance
1 drive per mirror pair*
Efficiency
50.0%
Excellent random I/O and rebuild behavior; capacity is typically 50% of raw. This scenario applies a 10% filesystem reserve.
Run Interactive Calculator →| Mode | Usable | Tolerance | Efficiency |
|---|---|---|---|
| RAID 5 | 118.80 TB | 1 drive | 91.7% |
| RAID 6 | 108.00 TB | 2 drives | 83.3% |
| RAID 10 | 64.80 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 118.80 TB | 1 drive | 91.7% |
| RAID-Z2 | 108.00 TB | 2 drives | 83.3% |
This NAS planning scenario estimates 64.80 TB usable after a 10% reserve from 144.00 TB raw.
For long-lived NAS pools, resiliency first is usually safer. Capacity can be expanded later, while a risky parity choice can force migration sooner.
This setup can tolerate 1 drive per mirror pair*. Real-world survivability depends on mirror placement, rebuild stress, and drive health.
No. Use this page for pre-purchase sizing, then validate with workload benchmarks, SMART health policy, and a tested restore plan.