By default SunOS 5.x comes with the automounter enabled. This implies that some filesystems such as /home will no longer be treated as normal directories. Despite this facilitates the administration of your system, in some situations you’ll want to avoid this behaviour.
To avoid the automounter to serve the /home directory as if it was an NFS resource and thus allowing you to mount the directory according to your needs, proceed as follows:
Edit /etc/auto_master and comment the line starting by /home. Then make sure to restart automount so it will reload its maps:
automount
/home under Solaris is an automount mount point by default and as so it’s not possible to create directories in it. And this is why /export/home is used to create actual home directories.