RAID 10 vs RAIDZ2 — 8×8 TB

You have 8 drives of 8 TB (64 TB raw) and are deciding between RAID 10 (striped mirrors — fast, one failure per mirror pair) and RAIDZ2 (ZFS double parity with checksums). The table shows what each choice actually gives you.

MetricRAID 10RAIDZ2
Usable capacity32 TB48 TB
Redundancy overhead32 TB16 TB
Storage efficiency50%75%
Fault tolerance (drives)1+2
Minimum drives44

RAIDZ2 gives you 16 TB more usable space on this configuration.

RAIDZ2 survives more simultaneous drive failures — with 8 drives of 8 TB, rebuild windows are long, and that margin is what saves the array when a second drive acts up mid-rebuild.

With drives of 8 TB and larger, single-parity rebuilds carry measurable URE risk — check yours in the rebuild calculator.

See it live

Open this exact configuration in the calculator and tweak drives, sizes and levels freely.

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