For giggles, did you check the power and data cable connections? Could be a wonky connection due to heat, gravity, vibration... (Or bad planet alignment, stray neutrino, forgot to pray to the silicon gods, etc. )
Not yet. It's an M.2, so, I really don't expect that anything can jiggle loose. And, sure, why not, I can remove it, and stick it back in, just because.
Smart isn't being super-helpful. "Error info log entries" but those could be literally anything; no spares used; manufacturer drive life at 1% used, 99% remaining. It's cool and didn't log heat issues at any point.
zpool status - scrub doesn't find issues either. Hmm. I may just watch it for now and see. I do wish I knew what to make of my increasing error count on those two LBAs.
Code:
pool: freenas-boot
state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
the pool may no longer be accessible by software that does not support
the features. See zpool-features(5) for details.
scan: scrub repaired 0B in 0 days 00:00:07 with 0 errors on Wed Jul 8 03:45:07 2020
config:
NAME STATE READ WRITE CKSUM
freenas-boot ONLINE 0 0 0
nvd0p2 ONLINE 0 0 0
errors: No known data errors