Comment by spoaceman7777
4 days ago
No, I'm talking about parity raid (raidz1/z2/z3, or, more familiarly, raid 5 and 6).
In a raidz1, you save one of the n drives' worth of space to store parity data. As long as you don't lose that same piece of data on more than one drive, you can reconstruct it when it's brought back online.
And, since the odds of losing the same piece of data on more than one drive is much lower than the odds of losing any piece of data at all, it's safer. Upping it to two drives worth of data, and you can even suffer a complete drive failure, in addition to sporadic data loss.
but this article is about unpowered ssds, those that are not in service but being kept for the data that is on them, as a type of back up copy. they could represent an entire raid set.