When prompted to “Use an existing mksysb image?” choose “No”
When prompted for “DVD backup media format?” choose “1 ISO9660 (CD format)”.
Choose the following options:
Back Up This System to ISO9660 DVD Type or select values in entry fields. Press Enter AFTER making all desired changes. [Entry Fields] DVD-R or DVD-RAM Device  + mksysb creation options: Create map files? yes + Exclude files? yes + Disable software packing of backup? no + Backup extended attributes? yes + File system to store mksysb image [/u2/mksysb] / (If blank, the file system will be created for you.) File system to store DVD file structure  / (If blank, the file system will be created for you.) File system to store final DVD images  / (If blank, the file system will be created for you.) If file systems are being created: Volume Group for created file systems [datavg] + Advanced Customization Options: Do you want the DVD to be bootable? yes + Remove final images after creating DVD? no + Create the DVD now? no + Install bundle file  / File with list of packages to copy to DVD  / Location of packages to copy to DVD  +/ Customization script  / User supplied bosinst.data file  / Debug output? no + User supplied image.data file  /
Press Enter to begin the system backup creation when you finish making selections. When the operation completes successfully, there is a file or files located in the /mkcd/cd_images directory.
Transfer the file to a workstation with DVD burner. You may transfer it via any method of your choosing (i.e. FTP, moving it to a samba share, etc.).
Create a bootable DVD from the ISO backup image using your DVD-burning software.