Evidence that --offroot is being used by systemd during boot:
Jan 04 10:26:22 dracor systemd-udevd[430]: Process '/sbin/mdadm --incremental
/dev/sdc1 --offroot' failed with exit code 1.
Jan 04 10:26:22 dracor systemd-udevd[428]: Process '/sbin/mdadm --incremental
/dev/sdb1 --offroot' failed with
I experienced and reported this issue on Ubuntu 16.04, but have now
verified that it also affects Ubuntu 18.04.3.
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https://bugs.launchpad.net/bugs/1858317
Title:
man mdadm does not docu
