How to make linear raid system in CentOS

Add raid system to CentOS is totally same as add new hard disk except constructing raid process (mdadm).
You can see the detail process how to add new hard disk post.



Sequences
Partitioning --> Raid construction (mdadm) --> Formatting (mkfs) --> Mount --> Register in 'fstab' file


Caution
You should set partition type to Linux raid auto.
You can check the fdisk status with 'fdisk -l  /dev/sdb  /dev/sdc


Raid construction
ex) mdadm --create /dev/md9  --level=linear  --raid-devices=2  /dev/sdb1  /dev/sdc1


Scan entire raid
mdadm  --detail  --scan
mdadm  --detail  /dev/md9


Restoration method in emergency mode
mdadm --run /dev/md5
* Some high version of CentOS provide it automatically
* Only raid level 1, 5 can be restored