The Brocade VDX 6720 Data Center Switches support two different airflow options:
Front-to-Back or Back-to-Front.
This airflow direction is determined by the integrated power supply or fan installed and the command to change the direction is;
If the VDX has this issue where the airflow direction does not match the
sysairflowdir, the switch will power down within two minutes after it fully boots to
prevent from it overheating.