Aren't you going to be running RAID on that volume? If so, you won't need LVM. In fact, I would strongly suggest against spanning an LVM across multiple drives without any redundancy down the line. Unless I'm completely missing you here?
If your stick does fail and you re-install the os, provided you are running RAID, mdadm will be able to string all the drives back together (I've done this many times). You simply mount the volume and all your data will be there. Not too sure about a spanned LVM volume, but like I said you shouldn't span such a big volume without redundancy.