I have created an iso image from a RHEL5.4 disc using mkisofs.

mkisofs -A "Red Hat Linux 5.4" -V "Red Hat Linux 5.4" -v -U -J -R -T
-b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot
-boot-load-size 4 -boot-info-table -o /tmp/RHEL54-x86_64-dvd.iso .

It creates the iso image no problem, however when I go to boot a new server from the disc I get the boot prompt, hit enter, answer the language and keyboard questions and then it throws the following error.

"The Red Hat Enterprise Linux Server CD was not found in any of your CDROM drives. Please insert the Red Hat Enterprise Linux Server CD and press OK to retry"

Does anyone know why this is happening? Perhaps I need to specify in my mkisofs command that its supposed to be iso9660?

This is on a RHEV virtual machine.

Thanks for any ideas or help you may have.

Ummm ... I'm not sure I see the point in your activity.

Why don't you just do
dd if=/dev/cdrom of=rhel.iso bs=2048 and point the the vm at rhel.iso?

Allow me to correct my earlier string...
I am trying to make an ISO from an existing ISO image.

Why?