NAS pSEO Landing
Estimate usable TB, parity overhead, and fault tolerance for 6x 6TB in RAID 10. Includes reserve planning for NAS and homelab arrays.
Raw Capacity
36.00 TB
Usable Capacity
16.20 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 | 27.00 TB | 1 drive | 83.3% |
| RAID 6 | 21.60 TB | 2 drives | 66.7% |
| RAID 10 | 16.20 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 27.00 TB | 1 drive | 83.3% |
| RAID-Z2 | 21.60 TB | 2 drives | 66.7% |
This NAS planning scenario estimates 16.20 TB usable after a 10% reserve from 36.00 TB raw.
It can be practical, but larger drives increase rebuild windows. Validate parity choice and backup policy before committing to the final layout.
For long-lived NAS pools, resiliency first is usually safer. Capacity can be expanded later, while a risky parity choice can force migration sooner.
No. Use this page for pre-purchase sizing, then validate with workload benchmarks, SMART health policy, and a tested restore plan.