Comment 4 for bug 1370533

It happens because we lock 200Mb on each disk for boot image. It was done in order to avoid issues with incorrect boot settings in bios. We are going to get rid of it in future. There is a bug https://bugs.launchpad.net/fuel/+bug/1258347 and a blueprint https://blueprints.launchpad.net/fuel/+spec/volume-manager-refactoring for that.