Alexander V. Makartsev wrote: > Probably you haven't installed "mdadm" package on Stretch. > Also it is generally a good idea to create a configuration file > "/etc/mdadm/mdadm.conf" [1] on Stretch. > You can use this command to create array configuration string from > metadata on disks: > # mdadm --examine --scan > > To check array status: > # mdadm --detail /dev/md0
I think this is the correct answer. The mdadm.conf file can also be copied over from buster.
