Replacing 2 software RAID, mirrored drives with larger ones but retaining all data..?

I'd like to upgrade my 2 20 gigabyte drives that I have mirrored using Redhat 9's software RAID. I want to keep all data and the OS, but go from the 2 20 gigabyte mirrored drives to a 120gig and 80gig mirrored (80gigs mirrored between the two, extra 40gigs left over). What is the easiest way to go about this?
I was thinking about merely adding one of the new drives to the existing array, then just taking the other two drives out and adding the other new drive to the array so I end up with the 2 new drives shifted into the array and the two old ones shifted out. Is this a possibility?
I set the array up originally in disk druid during the redhat 9 installation. As far as I can tell, there is no other way to run disk druid other than during the install process. How can I add a drive into a mirrored software raid array using fdisk? Is it even possible? Is there another utility someone can recommend?

Any solution for getting 2 new disks in this box, mirrored, and replacing the old mirrored disks, but retaining all the data and OS would be GREATLY appreciated. I have helped you guys out before.. can anyone help me?

 

 

 

 

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