Snapshot in Openstack
In cloud, whether openstack snapshot only contains system disk snapshot and data disk snapshot?
In data disk snapshot, someone calls it databases snapshot, whether they are a same thing?
and whether the snapshot will occupy more disk space? and whether if data disk's data occupy 18.7GB space, I create a snapshot for it, the data disk's data will occupy 18.7GB * 2 = 37.4GB ?