Create a new RAID array (raid-1) #
To create a new raid array, please type (for sda1 and sdb1 for example):
$ mdadm –create –verbose /dev/md0 –level=1 /dev/sda1 /dev/sdb1
Where /dev/sda1 and /dev/sdb1 have the same size.
To remove failing drive (eg. sda1) from array, you need to mark it as fail first by typing:
$ mdadm –fail /dev/md0 /dev/sda1
And remove it from array by typing following command:
$ mdadm –remove /dev/md0 /dev/sda1
You can also mark disk as failed and remove it in one line command:
$ mdadm /dev/md0 –fail /dev/sda1 –remove /dev/sda1
Add a new disk to an existing array:
$ mdadm –add /dev/md0 /dev/sdc1
Check the array status:
$ mdadm –detail /dev/md0
You can also check the array status by checking /proc/mdstat:
$ cat /proc/mdstat
To stop and remove RAID array, please type:
$ mdadm –stop /dev/md0
$ mdadm –remove /dev/md0
Please remember also to remove RAID super block:
$ mdadm –zero-superblock /dev/sda1
$ mdadm –zero-superblock /dev/sdab
