boot from a large iso file

[NiKiZe]

(2017-06-23 19:16)sleepybrown Wrote:  I'm using FOG on Ubuntu and want to load a Hiren Boot DVD that is over 2gb. The issue is that I run out of memory on the client PC.

If you run out of memory then you need to get more memory. Does this even work on a machine with lots of memory?
Because as has already been explained in this thread a couple of times already, the linux kernel does not have any way (by default) to actually handle the memdisk loaded content, so even if the first stage boot process would succeed, it would fail when trying to mount the DVD-Image. There is a few live-cds that might have the kernel support and helper scripts to handle this, but most of the time it is a bad idea, both for boot times, the bootscripts not finding the ISO as just described and also for the memory issue or similar that you are having. Instead only the kernel and initrd should be loaded by iPXE and then a url or NFS root should be provided to access the ISO or squashfs.