sigh, this is annoying. it appears that the arc firmware doesnt care if a volume is degraded, just if it is working or not. if a volume is degraded, its still online, so we have to go look for missing disks. if a disk has been replaced, but it is yet to be rebuilt, the firmware kindly tells us that it needs rebuilding. we can figure out if a volume is degraded using these two facts.
sigh, this is annoying. it appears that the arc firmware doesnt care if a
volume is degraded, just if it is working or not. if a volume is degraded,
its still online, so we have to go look for missing disks. if a disk has
been replaced, but it is yet to be rebuilt, the firmware kindly tells us
that it needs rebuilding. we can figure out if a volume is degraded using
these two facts.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars