md mdadm array inactive how to start and activate the RAID array
cat /proc/mdstat
Personalities : [raid1] [raid10] [linear] [multipath] [raid0] [raid6] [raid5] [raid4]
md124 : inactive sdj1[0](S)
1048512 blocks
Solution, we "run" the array
sudo mdadm --manage /dev/md124 --run
mdadm: started array /dev/md/0_0
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md, mdadm, array, inactive, activate, raid, arraycat, proc, mdstat, personalities, linear, multipath, sdj, quot, sudo, dev, _,