You might want to delete pages/frames 18 and 19 from the copy of the presentation you have uploaded for public consumption.
Otherwise, interesting to skim over... going forward as of late now that I've been using btrfs more, or even ext4, I'm starting to wonder if dm/lvm will be as needed for most purposes.
I say this as the last several file servers I've set up I've skipped on the dm/lvm layer entirely and in one case have a 5GB RAID1 on 2TB drives for the main OS w/ ext4 on the OS and storage area, while the other (newest) one I've gone with a 20MB RAID1 that holds just grub on ext2 (shared initramfs for mdadm setup/fall-back rescue shell, separate unique kernel images), with the whole main OS/file-server-space set up as a btrfs w/ quota and sub-volumes and what-not instead of lvm.
- WolfWings
