According to control.xml, 10 GiB is the minimum acceptable size to propose for / when snapshots are enabled (https://github.com/yast/skelcd-control-openSUSE/blob/SLE-15-GA/control/control.openSUSE.xml#L309) > <min_size config:type="disksize">5 GiB</min_size> > <snapshots_percentage config:type="integer">100</snapshots_percentage> That is, 5 GiB of minimum is no snapshots are enabled and 10 GiB if they are enabled. If those 10 GiBs are in fact not enough, the settings for the corresponding product/role must be adjusted in skelcd.