Comment by HorstG
6 years ago
Yes. RAIDz (without the "1") was the original RAID5-equivalent, RAIDz2 is equivalent to RAID6. However since nobody really knows what the hell z1 and z2 is and z1 is easy to mix up with RAID1 for nonZFS people, calling it z5 and z6 is far less confusing.
It's the number of parity disks, pretty simple. There has been occasional talk of making the number arbitrary, though presently only raidz1, raidz2, and raidz3 exist.