Are your arrays taged with your hostname? From Bug #252345 mdadm --incremental seems to block members with non-matching homehost tag and does not seem to have an option to disable that. (Or comprehend the --auto-update-homehost option as a workaround with the possible side effect to break other systems.)
Nice you found that out, Sami!
Are your arrays taged with your hostname? From Bug #252345 mdadm --incremental seems to block members with non-matching homehost tag and does not seem to have an option to disable that. (Or comprehend the --auto- update- homehost option as a workaround with the possible side effect to break other systems.)