NAS pSEO Landing
Estimate usable TB, parity overhead, and fault tolerance for 10x 14TB in RAID-Z1. 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%
ZFS single-parity equivalent of RAID 5; common for smaller homelab pools. 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% |
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.
No. Use this page for pre-purchase sizing, then validate with workload benchmarks, SMART health policy, and a tested restore plan.
It can be practical, but larger drives increase rebuild windows. Validate parity choice and backup policy before committing to the final layout.