NAS pSEO Landing
Estimate usable TB, parity overhead, and fault tolerance for 12x 16TB in RAID 1. Includes reserve planning for NAS and homelab arrays.
Raw Capacity
192.00 TB
Usable Capacity
14.40 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 | 158.40 TB | 1 drive | 91.7% |
| RAID 6 | 144.00 TB | 2 drives | 83.3% |
| RAID 10 | 86.40 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 158.40 TB | 1 drive | 91.7% |
| RAID-Z2 | 144.00 TB | 2 drives | 83.3% |
This NAS planning scenario estimates 14.40 TB usable after a 10% reserve from 192.00 TB raw.
This setup can tolerate 11 drives*. Real-world survivability depends on mirror placement, rebuild stress, and drive health.
For long-lived NAS pools, resiliency first is usually safer. Capacity can be expanded later, while a risky parity choice can force migration sooner.
It can be practical, but larger drives increase rebuild windows. Validate parity choice and backup policy before committing to the final layout.