Comment # 26 on bug 1093372 from Ancor Gonzalez Sosa

I don't think the adjustments done to the volumes match with the original
intention. See this extract of the root and home volumes done in the already
mentioned SR https://build.opensuse.org/request/show/651339.

<volume>
    <mount_point>/</mount_point>
    <fs_type>btrfs</fs_type>

    <desired_size>10 GiB</desired_size>
    <min_size>5 GiB</min_size>
    <max_size>unlimited</max_size>

    <snapshots_percentage>300</snapshots_percentage>
</volume>

<volume>
    <mount_point>/home</mount_point>
    <fs_type>xfs</fs_type>

    <desired_size>40 GiB</desired_size>
    <min_size>10 GiB</min_size>
    <max_size>unlimited</max_size>

    <!-- if this volume is disabled we want "/" to increase -->
    <fallback_for_desired_size>/</fallback_for_desired_size>
    <fallback_for_max_size>/</fallback_for_max_size>
    <fallback_for_max_size_lvm>/</fallback_for_max_size_lvm>
    <fallback_for_weight>/</fallback_for_weight>
</volume>

According to that, if a separate home is not proposed, the desired size for
root is 50GiB (specified via fallback_for_desired_size). And that amount is
then multiplied by 4 (or increased by a 300% to be more correct) because of the
snapshots and the value of snapshots_percentage.

Likely that was not the intended behavior. I guess fallback_for_desired_size
should not be set (if the intention is to reduce the requirements).