[CentOS] Add RAID after install in one disk

[CM]

> 
> IIRC, you also have to do some special magic with the grub config to 
> make the machine boot nicely even if you have to reboot with one drive
> 
> down. Unfortunately, it's been a while since last time I did this, so
> I  can't remember.
> 
> -- 
>   Haakon Gjersvik Eriksen     --                  Basefarm AS

Presuming sda first HDD, sdb second HDD, first partition (0)  is /boot

grub
device (hd1) /dev/sdb
root (hd1,0)
setup (hd1)

CM

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