NLUUG: Minimizing downtime on servers using NanoBSD, ZFS, and jails

I'm suggesting using multiple disk images sitting on a single btrfs system. That way an image can be copied w/o shutting down the instance, because we made a snapshot of the whole btrfs system before we started the instance, or instances The only reason I'm suggesting btrfs in place of lvm, is that I don't care for lvm, and I keep hearing people say it's the future of Linux filesystems.