mdadm how to make inactive array active

This happens when you assemble array it doesn't mean it will be active for many reasons:

md20 : inactive sdf1[2](S)
      732442488 blocks super 1.2

Solution:

 sudo mdadm --manage /dev/md20  --run


Tags:

mdadm, inactive, array, activethis, assemble, doesn, active, md, sdf, sudo, dev,

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