Not sure what sort of details you're looking for, but I have 5 xfs formatted array disks and a single parity. Looking at the source code, I think this is the offending line: https://github.com/jcofer555/automover/blob/99b4d474624474e28378b818d83c2fb2d2758a0b/src/usr/local/emhttp/plugins/automover/helpers/automover.sh#L984 It doesn't have the same alternate logic for zfs as the other usages of `df`, and it fits with the log message where I see it reports 1% usage.