[CentOS] raid 1 disks upgrade

Mon Jul 13 10:13:26 UTC 2009
Coert Waagmeester <lgroups at waagmeester.co.za>

Hello all,

I have a machine with 2 SATA 250GB disks which I want to upgrade to 1TB

This is the partition structure on both disks:

Disk /dev/sda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          25      200781   fd  Linux raid
/dev/sda2              26        1971    15631245   fd  Linux raid
/dev/sda3            1972       30401   228363975   fd  Linux raid

there are 3x RAID1 arrays. 
First is for /boot
Second if for swap
Third is for LVM (contains / and other filesystems)

What is the easiest way to get this upgraded?

I thought that I could maybe dd all the LVM volumes and /boot into
files, setup the new RAID1 arrays on the 1TB disks, and dd everything
back? or is there an easier way?