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RAIDZ levels reference covers various aspects and tradeoffs of the different RAIDZ levels.
RAIDZ levels comparison chart
| - | Stripe | Mirror | RAIDZ | RAIDZ2 | RAIDZ3 | Stripe+mirror |
|---|---|---|---|---|---|---|
| Min number of disks | 1 | 2 | 2 | 4 | 5 | 4 |
| Fault tolerance | None | (N-1) disk | 1 disk | 2 disks | 3 disk | (N-1) disk in each N-disk mirror |
| Disk space overhead | None | (N-1)/N | 1 disk | 2 disks | 3 disks | (N-1)*P for P stripe over N-disk mirrors |
| Read speed | Fast | Fast | Slow, see below | Slow, see below | Slow, see below | Fast |
| Write speed | Fast | Fair | Slow, See below | Slow, see below | Slow, see below | Fair |
| Hardware cost | Cheap | High to highest | High | Very high | Very High (disks) | High to highest |
