One of my drives in my RAID died, so I went and bought a 3TB drive for a replacement. The RAID is only 1T, so I'll use the rest of it for something else.
It drives me nuts that every site out there describes in great detail how to do different things. Anyone can read the man page, or issue the parted "help mkpart" for example; but what I usually look for is a quick start. So, here's a quick rundown on how I re-set up the RAID drive. At the bottom is a full rundown on how I think I originally setup the RAID, but don't quote me on it. 😀
We run through the basic use of parted and mdadm.
Well, I've had a lot of trouble switching my system from LVM, to RAID1+LVM on ubuntu 10.04. I got another drive for my system, created a mirror with one drive (temporarily of course) asked lvm to move my entire system over to that physical device, added the previous drive to the raid array, and rebooted (oops). I am listing a few things that are important to know when you're both new to Ubuntu, and doing raid post installation of Ubuntu.