Does anyone reuse /boot or /var partitions ?

[Chris Murphy]

Looks like UsrMove fixed the problem with separate /usr volume.

This is the layout I tested:
UUID=5AC5-5766          /boot/efi               vfat
x-systemd.automount,noauto,umask=0077,shortname=winnt 0 0
UUID=8fd67b94-0dd5-4df0-a690-066460e47fd8 /
btrfs   subvol=root     0 0
UUID=8fd67b94-0dd5-4df0-a690-066460e47fd8 /usr
btrfs   subvol=usr     0 0
UUID=8fd67b94-0dd5-4df0-a690-066460e47fd8 /boot
btrfs   subvol=boot     0 0
UUID=8fd67b94-0dd5-4df0-a690-066460e47fd8 /home
btrfs   subvol=home     0 0

Boot and updates with yum, dnf and pk-offline all work.

The stateful settings and files in /var, /etc, and optionally /home
can all go together on root. And stateless stuff on /usr. This seems
more coherent than a bunch of different mountpoints under var; and
even var on its own has been rather problematic.

I'm guessing the installer doesn't permit separate /usr for legacy,
pre-usrmove reasons. This layout is also compatible with the proposal
found here:
http://0pointer.net/blog/revisiting-how-we-put-together-linux-systems.html

-- 
Chris Murphy