NAS pSEO Landing
Estimate usable TB, parity overhead, and fault tolerance for 12x 8TB in RAID 10. Includes reserve planning for NAS and homelab arrays.
Raw Capacity
96.00 TB
Usable Capacity
43.20 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 | 79.20 TB | 1 drive | 91.7% |
| RAID 6 | 72.00 TB | 2 drives | 83.3% |
| RAID 10 | 43.20 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 79.20 TB | 1 drive | 91.7% |
| RAID-Z2 | 72.00 TB | 2 drives | 83.3% |
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.
This setup can tolerate 1 drive per mirror pair*. Real-world survivability depends on mirror placement, rebuild stress, and drive health.
This NAS planning scenario estimates 43.20 TB usable after a 10% reserve from 96.00 TB raw.