Comment 7 for bug 1811473

There are two commits went in.
https://github.com/openstack/stx-metal/commit/fe397d5d276dfb9dd979216b7ab54be17c7b6e89
https://github.com/openstack/stx-config/commit/6da46d861bd16cf4441ba107fb178c154a8c7f57

Because docker-lv size is increased to 30GB for all the nodes, the default root disk size for all the nodes are increased.