NAS pSEO Landing
Region Focus · US
Estimate usable TB, parity, and fault tolerance for US homelab buyers using 6x 8TB in RAID 6.
Raw Capacity
48.00 TB
Usable Capacity
28.80 TB
Fault Tolerance
2 drives
Efficiency
66.7%
Safer for larger arrays with dual parity, at the cost of one extra parity disk. This scenario applies a 10% filesystem reserve.
Run Interactive Calculator →| Mode | Usable | Tolerance | Efficiency |
|---|---|---|---|
| RAID 5 | 36.00 TB | 1 drive | 83.3% |
| RAID 6 | 28.80 TB | 2 drives | 66.7% |
| RAID 10 | 21.60 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 36.00 TB | 1 drive | 83.3% |
| RAID-Z2 | 28.80 TB | 2 drives | 66.7% |
US buyers often evaluate frequent pricing swings and promo cycles. Capacity planning should account for staged purchases instead of one-time all-disk upgrades.
Planning metric that compares real usable capacity after reserve and parity.
Seasonal pricing period used for phased drive purchasing strategies.
For long-lived NAS pools, resiliency first is usually safer. Capacity can be expanded later, while a risky parity choice can force migration sooner.
Keeping free space improves filesystem behavior for snapshots, metadata, and write performance. Full arrays often perform worse and rebuild more slowly.
It can be practical, but larger drives increase rebuild windows. Validate parity choice and backup policy before committing to the final layout.
For US homelab buyers, this NAS planning scenario estimates 28.80 TB usable after a 10% reserve from 48.00 TB raw.