If I didn’t have to spend a bunch of time moving virtual machines around, this probably wouldn’t matter very much. But, alas, I did find myself building zfs raid arrays a few times and couldn’t seem to remember what I wanted where. 🧂 Take with a conservative grain of salt. RAID Type Min Disks Usable Capacity Fault Tolerance Performance Notes Notes Striped 1+ 100% of total None Fastest read/write, no redundancy Equivalent to RAID0 Mirror 2+ 50% of total 1 disk per mirror vdev Excellent read, good write, fast recovery Equivalent to RAID1 in traditional RAID RAIDZ1 3+ N - 1 1 disk failure Slower write, decent read Similar to RAID5 RAIDZ2 4+ N - 2 2 disk failures Slower write, decent read Similar to RAID6 RAIDZ3 5+ N - 3 3 disk failures Slowest write, decent read For high fault tolerance ZFS RAID10 4+ (even) 50% of total 1 disk per mirror vdev Best balance of performance + redundancy Stripe of mirrors (manual mirror vdevs) dRAID 3+ Varies (RAIDZ-like) Parity-based (configurable) Improved resilver vs.