[root@alanstudio]# cat /proc/mdstat

Check software raid all md statu

[root@alanstudio]# mdadm -D /dev/md0

Check software raid md0 detial status

[root@alanstudio]# mdadm /dev/md0 --add /dev/hdc1

[root@alanstudio]# mdadm --manage -add /dev/md0 /dev/hdc1

Add back the new devices and rebuild the raid

[root@alanstudio]# mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1

Create software raid 1 md0 with device sda1,sdb1

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