[CentOS] Transferring system to new RAID drive

Is there a document with instructions for this? I've had smartd warnings that a hard disk in my server is sick, so I am installing a new drive (in addition to the old).

Not to hijack a thread but on a similiar note. I have a Centos 4.x server with a 500G sata drive working fine except for disk I/O issues at peak times. I have copied it to a new drive before using 'dd if=/dev/sda of=/dev/sdb bs=16384' in middle of night offline. I did that in past because 'smartctl -a /dev/sda' did not work on the old drive. Is there a way to copy it to a hardware RAID 1 array of two drives in a similiar way? If so what not too expensive 2 port hardware raid controller do you reccommend and how do you do it? Thanks.

Matt