NAS pSEO Landing
Brand Focus · Synology
Estimate usable capacity, fault tolerance, and efficiency for Synology NAS users using 4x 8TB in RAID 10.
Raw Capacity
32.00 TB
Usable Capacity
14.40 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 | 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% |
Synology users usually optimize for predictable rebuild behavior and conservative free-space policies, especially when using large-capacity SHR/RAID pools for media and backup workloads.
Synology Hybrid RAID that improves flexibility when mixing drive sizes.
Point-in-time snapshots used for rollback and data protection policies.
Logical disk group where RAID layout is created before volumes are provisioned.
This setup can tolerate 1 drive per mirror pair*. Real-world survivability depends on mirror placement, rebuild stress, and drive health.
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.
For Synology users, this NAS planning scenario estimates 14.40 TB usable after a 10% reserve from 32.00 TB raw.