NAS pSEO Landing
Estimate usable TB, parity overhead, and fault tolerance for 10x 14TB in RAID 5. Includes reserve planning for NAS and homelab arrays.
Raw Capacity
140.00 TB
Usable Capacity
113.40 TB
Fault Tolerance
1 drive
Efficiency
90.0%
Balanced capacity and redundancy, but rebuild stress can be high on large disks. This scenario applies a 10% filesystem reserve.
Run Interactive Calculator →| Mode | Usable | Tolerance | Efficiency |
|---|---|---|---|
| RAID 5 | 113.40 TB | 1 drive | 90.0% |
| RAID 6 | 100.80 TB | 2 drives | 80.0% |
| RAID 10 | 63.00 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 113.40 TB | 1 drive | 90.0% |
| RAID-Z2 | 100.80 TB | 2 drives | 80.0% |
No. Use this page for pre-purchase sizing, then validate with workload benchmarks, SMART health policy, and a tested restore plan.
Keeping free space improves filesystem behavior for snapshots, metadata, and write performance. Full arrays often perform worse and rebuild more slowly.
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 NAS planning scenario estimates 113.40 TB usable after a 10% reserve from 140.00 TB raw.