I'm still patiently holding out for the first (current, usable) filesystem that let's us set a parity fraction and let me use FEC to heal small errors.
Occurs to me know that as a practical matter perhaps raw storage will solve this for a lot of people. The pace of increase in storage/$ still seems to be steady, and in turn continues to mean more and more people trivially have their total needs exceeded. At some point may be perfectly reasonable to throw half at redundancy?
If you want repair, you need to either set more than one copy in ZFS (still pretty dumb) or use multiple drives in a raidz (or mirror, though raidz is more efficient).
When you try to partition a drive like this (or configure ZFS to write multiple copies) you loose everything in the event that the whole drive fails. Honestly, it's a far better plan to just use multiple drives in a raidz so that whole-drive failures can be reconstructed in addition to data corruption.
* https://docs.ceph.com/en/latest/rados/operations/erasure-cod...