On Sat, Jun 23, 2012 at 11:57 AM, hadi motamedi <motamedi24 at gmail.com> wrote: > Thank you very much for your reply. Sorry I meant software RAID to > install the service of RAID how to enable and configure the RAID > service. The CentOS 6.2 default kernel and installation provide the mdadm (sw) raid functionality. The following <https://raid.wiki.kernel.org/index.php/RAID_setup> contain the steps to configure mdadm RAID1. The key thing would be to decide on the partition sizes and they should be identical on both disks when you create the RAID device(s). HTH, -- Arun Khan