QNAP 10x 12TB RAID 5 NAS Calculator

Estimate usable TB, parity, and fault tolerance for QNAP NAS users using 10x 12TB in RAID 5.

Capacity Snapshot

Raw Capacity

120.00 TB

Usable Capacity

97.20 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.

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Alternative Mode Comparison

Mode	Usable	Tolerance	Efficiency
RAID 5	97.20 TB	1 drive	90.0%
RAID 6	86.40 TB	2 drives	80.0%
RAID 10	54.00 TB	1 drive per mirror pair*	50.0%
RAID-Z1	97.20 TB	1 drive	90.0%
RAID-Z2	86.40 TB	2 drives	80.0%

QNAP Planning Notes

QNAP buyers often compare capacity efficiency against service consolidation needs, where VM storage, containers, and media serving all compete for IOPS and free space.

• Model around mixed workloads: media throughput plus VM random I/O.
• Reserve enough headroom so thin-provisioned services do not overrun the array.
• When in doubt, prioritize safer parity for arrays above 6 drives.

Brand / Region Glossary

Qtier

QNAP auto-tiering system that moves hot and cold data across storage classes.

Storage & Snapshots

QTS module for RAID pool management, volume control, and snapshots.

Thin Provisioning

Allocates logical space first and consumes physical capacity over time.

NAS Cluster Guides

NAS Hub RAID Level Compare RAID Capacity Matrix Planning Quick Sheet RAID Selector NAS FAQ

Related Long-Tail Calculators

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Sequential Long-Tail Navigation

← Previous: Synology 10x 12TB RAID 5 NAS Calculator Next: TrueNAS 10x 12TB RAID 5 NAS Calculator →

FAQ

How much real-world usable storage does 10x 12TB RAID 5 provide?

For QNAP users, this NAS planning scenario estimates 97.20 TB usable after a 10% reserve from 120.00 TB raw.

Why include a 10% reserve when planning NAS capacity?

Keeping free space improves filesystem behavior for snapshots, metadata, and write performance. Full arrays often perform worse and rebuild more slowly.

How many disk failures can RAID 5 tolerate in this setup?

This setup can tolerate 1 drive. Real-world survivability depends on mirror placement, rebuild stress, and drive health.

Should I optimize this 10-drive plan for available space or resiliency first?

For long-lived NAS pools, resiliency first is usually safer. Capacity can be expanded later, while a risky parity choice can force migration sooner.