Need some help developing a strategy

[Prometheus418]

Hi all-

I've got a pair of Debian servers running some django sites, and they've been working good for me for quite a while.

The problem is that when I set them up, I did not really configure the system the way I should have, and our PLM system is storing files in the Root filesystem. So now I have a Raid 5 array sitting basically unused, and a root partition that won't behave because it is maxed out.

I have resized partitions with Gparted before, but only on single disks- I used a live usb to look at it, but it doesn't rebuild the array and I don't want to mess the entire system up. They are LVM partitions, so I am hoping that there is a way to simply grow the root folder into the home partition without too much hassle. The home partition exists, but I don't really use it for anything. If I shrink it and lose some data, I don't really care about that- I just want the root partition larger.

Here's what lsblk gives me:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 3.7T 0 disk
└─md126 9:126 0 10.4T 0 raid5
├─md126p1 259:0 0 768K 0 md
├─md126p2 259:1 0 244.1M 0 md /boot
└─md126p3 259:2 0 10.4T 0 md
├─RMopenPLM--vg-root (dm-0) 253:0 0 9.3G 0 lvm /
├─RMopenPLM--vg-swap_1 (dm-1) 253:1 0 31.9G 0 lvm [SWAP]
└─RMopenPLM--vg-home (dm-2) 253:2 0 10.3T 0 lvm /home
sdb 8:16 0 3.7T 0 disk
└─md126 9:126 0 10.4T 0 raid5
├─md126p1 259:0 0 768K 0 md
├─md126p2 259:1 0 244.1M 0 md /boot
└─md126p3 259:2 0 10.4T 0 md
├─RMopenPLM--vg-root (dm-0) 253:0 0 9.3G 0 lvm /
├─RMopenPLM--vg-swap_1 (dm-1) 253:1 0 31.9G 0 lvm [SWAP]
└─RMopenPLM--vg-home (dm-2) 253:2 0 10.3T 0 lvm /home
sdc 8:32 0 3.7T 0 disk
└─md126 9:126 0 10.4T 0 raid5
├─md126p1 259:0 0 768K 0 md
├─md126p2 259:1 0 244.1M 0 md /boot
└─md126p3 259:2 0 10.4T 0 md
├─RMopenPLM--vg-root (dm-0) 253:0 0 9.3G 0 lvm /
├─RMopenPLM--vg-swap_1 (dm-1) 253:1 0 31.9G 0 lvm [SWAP]
└─RMopenPLM--vg-home (dm-2) 253:2 0 10.3T 0 lvm /home
sdd 8:48 0 3.7T 0 disk
└─md126 9:126 0 10.4T 0 raid5
├─md126p1 259:0 0 768K 0 md
├─md126p2 259:1 0 244.1M 0 md /boot
└─md126p3 259:2 0 10.4T 0 md
├─RMopenPLM--vg-root (dm-0) 253:0 0 9.3G 0 lvm /
├─RMopenPLM--vg-swap_1 (dm-1) 253:1 0 31.9G 0 lvm [SWAP]
└─RMopenPLM--vg-home (dm-2) 253:2 0 10.3T 0 lvm /home
sde 8:64 1 14.6G 0 disk
└─sde1 8:65 1 14.6G 0 part /usr
sr0 11:0 1 1024M 0 rom

Anyone able to spare a few moments to help me out? Some of the packages needed for the software are older, and I'd rather not reinstall if it can be avoided.

Thanks!