I would like to use LVM2's built-in RAID support (lvconvert -m1 --type raid1 vgname/lvname) on my Ubuntu 12.04 LTS server. Unfortunately this feature appeared in LVM2 2.02.89 (assuming I've read the changelog correctly), while Ubuntu 12.04 has LVM2 2.02.66.
What are my options? Is there a backport of newer LVM2 somewhere? Will a newer lvm2 package require a newer kernel than the one in 12.04, or are these features managed in userspace somehow?
A backported LVM package seems safe enough. If the kernel doesn't support the md/dm integration, I expect it will fail the conversion step, at which point you could just backport the kernel too.