If you want to boot the installation program from a hard drive, you can optionally install the zipl boot loader on the same (or a different) disk. Be aware that zipl only supports one boot record per disk. If you have multiple partitions on a disk, they all "share" the disk's single boot record.
To prepare a hard drive to boot the installation program, install the zipl boot loader on the hard drive by entering the following command:
zipl -V -t /mnt/ -i /mnt/images/kernel.img -r /mnt/images/initrd.img -p /mnt/images/generic.prm