'Splits a SC size string into GB and a remainder.
Space is returned in a string like ...
7.38197504E8 Bytes
Need to split that apart and convert to GB.
:param spacestring: SC size string.
:return: Size in GB and remainder in byte.'

@staticmethod
def size_to_gb(spacestring):

    try:
        n = spacestring.split('    ', 1)
        fgb = int((float(n[0]) // 1073741824))
        frem = int((float(n[0]) % 1073741824))
        return (fgb, frem)
    except Exception:
        raise exception.VolumeBackendAPIException(data=_('Error    retrieving    volume    size'))
