The automount facility is a physical file system (PFS) that is started with a FILESYSTYPE statement in the BPXPRMxx parmlib member. After the PFS is started, the automount facility manages the policy that you make active by using the /usr/sbin/automount command. You can change the automount policy at any time, although you cannot set it to null. To change it, update the automount configuration files (/etc/auto.master and MyMap). Then activate that configuration with the /usr/sbin/automount command.