`mdadm` – manage MD devices aka Linux Software Raid (directly from `man` pages)
1. Finding out the RAID arrays (md0, md1, etc..). In all the below examples I have taken `md0` as the RAID array.
[root@library-server ~]#fdisk -l
2. Querying the arrays to find the disks it holds,
[root@library-server ~]#mdadm – -detail /dev/md0
3. Shutting the desired array,
[root@library-server ~]# mdadm – -stop /dev/md0
4. Zeroing the superblock for each drive,
[root@library-server ~]# mdadm – -zero-superblock /dev/sdX (or hdX)
5. Creating the new array,
[root@library-server ~]#mdadm – -create /dev/md0 – -chunk=4 – -level=0 – -raid-devices=2 /dev/sda1 /dev/sdb1
where sda1 and sdb1 are the partitions. The above command will create a raid0 array /dev/md0 formed from /dev/sda1 and /dev/sdb1, with chunk size 4.
6. Create an ext3 filesystem on /dev/md0,
[root@library-server ~]#mkfs.ext3 /dev/md0
Mount this partition and you are ready to push in your data. This above method worked for me. Hope this helps.
Oops, forgot to include one line in /etc/mdadm/mdadm.conf,
ARRAY /dev/md0 devices=/dev/sda1,/dev/sdb1
where `md0` – array defined and `sda1`, `sdb1` are the hard disk partitions from where the array is created. Restart the `mdadm` service.