You can replace internal power supplies and fan modules, as needed, while the switch is operating ("hot swapping"). However, if you are changing the airflow direction of the internal power supplies and fan modules, you must power down the switch.
For each switch, ensure that all installed power supplies and fan modules have the same the airflow direction: either front-to-back or back-to-front.
Follow the procedures in this section to remove and replace power supplies and fan modules, and to remove a switch from a rack.