NAS pSEO Landing
Brand Focus · QNAP
Estimate usable capacity, fault tolerance, and efficiency for QNAP NAS users using 4x 8TB in RAID 6.
Raw Capacity
32.00 TB
Usable Capacity
14.40 TB
Fault Tolerance
2 drives
Efficiency
50.0%
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 | 21.60 TB | 1 drive | 75.0% |
| RAID 6 | 14.40 TB | 2 drives | 50.0% |
| RAID 10 | 14.40 TB | 1 drive per mirror pair* | 50.0% |
| RAID-Z1 | 21.60 TB | 1 drive | 75.0% |
| RAID-Z2 | 14.40 TB | 2 drives | 50.0% |
QNAP buyers often compare capacity efficiency against service consolidation needs, where VM storage, containers, and media serving all compete for IOPS and free space.
QNAP auto-tiering system that moves hot and cold data across storage classes.
QTS module for RAID pool management, volume control, and snapshots.
Allocates logical space first and consumes physical capacity over time.
For QNAP users, this NAS planning scenario estimates 14.40 TB usable after a 10% reserve from 32.00 TB raw.
Keeping free space improves filesystem behavior for snapshots, metadata, and write performance. Full arrays often perform worse and rebuild more slowly.
This setup can tolerate 2 drives. Real-world survivability depends on mirror placement, rebuild stress, and drive health.
No. Use this page for pre-purchase sizing, then validate with workload benchmarks, SMART health policy, and a tested restore plan.