def METHOD_NAME(self):
    for sv, ld in self.svld:
        try:
            src = self.array.sc_query_ld(sv)['LD Name']
        except:
            raise ex.Error("can not determine source LD for SV:%s" % sv)
        self.wait_for_changing_snap(src)
        self.array.sc_create_ld(src, sv)