To enable Xvfb:
Log on to the computer on which you are running the Reporting and Analysis Web application server components as the root user.
Determine whether Virtual Frame Buffer support is available on your computer by issuing the following command:
lslpp -l X11.vfb
If X11.vfb is not installed, install it from your AIX installation media. After installing the package, apply the latest PTF from:
/usr/bin/X11/X -force -vfb :1
where :1 is the a display number not already in use.