Hi @lleb, @Emerson, @chrism01
Thanks for help.
1. I tried smartctl and it shows that the system uses hardware raid controller - AMCC/3ware controller
smartctl -a /dev/sda
smartctl 5.43 2012-06-30 r3573 [x86_64-linux-2.6.32-431.el6.x86_64] (local build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net
Smartctl open device: /dev/sda failed: AMCC/3ware controller, please try adding '-d 3ware,N',
you may need to replace /dev/sda with /dev/twlN, /dev/twaN or /dev/tweN
2. As I can see the 2nd disk uses windows ntfs partition. How can I format it and use it as a part of raid-1 config? Any one can help on this please?