Reading ZFS scrub output without fear

2026-03-02

ZFS scrubs look scary until you know which line matters. Most of the output is reassurance; one field is the alarm.

scan: scrub repaired 0B in 03:12:45 with 0 errors

Repaired bytes going up a little is normal on aging disks. Errors going above zero is the line I actually alert on. Everything else is noise I taught myself to ignore.