Keep in mind that...yes...you're free to use 1G or 10G physical ports (with respect to Aruba 5400R zl2 which requires/admits only either 10G or 40G physical ports) to form the VSF logical ports but then - as I understood it - a single VSF logical port must have physical members ports with same media speed (so, for each VSF logical port, either 1G or 10G physical ports are admitted as member ports, 1G/10G mixes are not admitted at all).