Check out Parity Lost and Parity Regained and Characteristics, Impact, and Tolerance of Partial Disk Failures (which this blog indirectly cites) if you'd like authoritative reading on the topic.

https://www.usenix.org/legacy/event/fast08/tech/full_papers/...

https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&d...