On 03/06/2020 03:33 PM, William Morgan wrote: > I tried re-add and I get the following error: > > bill@bill-desk:~$ sudo mdadm /dev/md0 --re-add /dev/sdl1 > mdadm: Cannot open /dev/sdl1: Device or resource busy > > sdl is not mounted, and it doesn't seem to be a device mapper issue: cat /proc/mdstat and/or cat /proc/partitions and see if the disk was brought up as an array of its own (something like /dev/md127, etc..), If so, simply sudo mdadm --stop /dev/md127 The try you re-add again. I recently had that occur when I put in a replacement disk for a raid1 array. Even though I just cut the plastic anti-static bag off the brand-new drive, when I booted the system, it came up as an array (of what I don't know). I got the same device busy and simply used --stop on the obviously not-an-array array, The --re-add worked just fine afterwards. -- David C. Rankin, J.D.,P.E.
