NAS pSEO Landing
Estimate usable TB, parity overhead, and fault tolerance for 12x 14TB in RAID 1. Includes reserve planning for NAS and homelab arrays.
Raw Capacity
168.00 TB
Usable Capacity
12.60 TB
Fault Tolerance
11 drives*
Efficiency
8.3%
Strong redundancy but low capacity efficiency. Great for small, critical datasets. This scenario applies a 10% filesystem reserve.
Run Interactive Calculator →| Mode | Usable | Tolerance | Efficiency |
|---|---|---|---|
| RAID 5 | 138.60 TB | 1 drive | 91.7% |
| RAID 6 | 126.00 TB | 2 drives | 83.3% |
| RAID 10 | 75.60 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 138.60 TB | 1 drive | 91.7% |
| RAID-Z2 | 126.00 TB | 2 drives | 83.3% |
This setup can tolerate 11 drives*. 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.
This NAS planning scenario estimates 12.60 TB usable after a 10% reserve from 168.00 TB raw.
It can be practical, but larger drives increase rebuild windows. Validate parity choice and backup policy before committing to the final layout.