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TrueNAS RAID 10 vs RAID 5 Storage Calculator

Compare usable capacity, fault tolerance, and efficiency between RAID 10 and RAID 5 for TrueNAS NAS users.

Comparison Notes

This page compares RAID 10 and RAID 5 on identical hardware assumptions to help homelab builders choose between capacity efficiency and fault tolerance.

  • Disk size baseline: 8TB drives
  • Reserve policy: 10% filesystem headroom
  • Use the interactive tool for exact real-world constraints
Open Interactive Planner →

Storage Capacity Table

Drives RAID 10 RAID 5 Delta
4x 8TB 14.40 TB 21.60 TB -7.20 TB
6x 8TB 21.60 TB 36.00 TB -14.40 TB
8x 8TB 28.80 TB 50.40 TB -21.60 TB
10x 8TB 36.00 TB 64.80 TB -28.80 TB
12x 8TB 43.20 TB 79.20 TB -36.00 TB

TrueNAS / ZFS Planning Notes

TrueNAS and ZFS planners usually care about parity width, scrub cadence, and healthy operating headroom. Capacity is only one part of pool durability.

Brand / Region Glossary

vdev

A virtual device group in ZFS; multiple vdevs form a storage pool.

Scrub

Background integrity scan that verifies checksums and repairs parity mismatches.

RAID-Z Expansion

ZFS feature set and planning topic for growing parity groups safely.

Related Long-Tail Calculators

2x 4TB RAID 1 2x 6TB RAID 1 2x 8TB RAID 1 2x 10TB RAID 1 2x 12TB RAID 1 2x 14TB RAID 1 2x 16TB RAID 1 2x 18TB RAID 1 2x 20TB RAID 1 3x 4TB RAID 1 3x 4TB RAID 5 3x 4TB RAID-Z1 3x 6TB RAID 1 3x 6TB RAID 5 3x 6TB RAID-Z1 3x 8TB RAID 1

FAQ

Does this comparison include filesystem reserve?

Yes. The comparison table applies a 10% reserve baseline to reflect realistic operating headroom in NAS and homelab environments.

Can two layouts with similar available space still have very different rebuild risk?

Yes. Similar usable TB does not imply similar failure tolerance or rebuild exposure. Capacity and resiliency should be evaluated together.

Which has more effective capacity: RAID 10 or RAID 5?

For TrueNAS users, this NAS planning scenario compares both modes at fixed drive sizes so you can see usable capacity differences before buying disks.

Does RAID 10 rebuild faster than RAID 5?

Rebuild behavior depends on array width, disk size, and workload pressure. This page focuses on capacity and tolerance; benchmark your actual platform before final choice.