Comment 4 for bug 1793543

Reviewed: https://review.openstack.org/604765
Committed: https://git.openstack.org/cgit/openstack/stx-config/commit/?id=db994ba20f761426c5c79dfa2aa4fd7b77c58a49
Submitter: Zuul
Branch: master

commit db994ba20f761426c5c79dfa2aa4fd7b77c58a49
Author: Stefan Dinescu <email address hidden>
Date: Mon Sep 24 15:34:02 2018 +0300

    Change backup partition size for small disks

    Minimum backup partition size is calculated as the sum between the
    sizes of the glance and database partitions, as well as a 20GB
    overhead.

    This fix increase the default backup size partition to 40GB to
    be in line with the above calculations, considering the database
    and the glance partitions are 10GB each by default.

    This also increases the minimum disk requirements from 120GB
    to 130GB.

    Change-Id: I15396c92136562188f9cdf82afa473361cb45aeb
    Closes-bug: 1793543
    Signed-off-by: Stefan Dinescu <email address hidden>