def initLVM(self):
(vgname, lvname)=LogicalVolume.splitLVPath(self.getDeviceName())
self.volumegroup=VolumeGroup(vgname, self.getDocument())
self.logicalvolume=LogicalVolume(lvname, self.volumegroup, self.getDocument())
self.volumegroup.init_from_disk()
self.logicalvolume.init_from_disk()
