Well I just did what you did (in reply to comment http://ps3crunch.com/asbestos-instal...#comment-16274
), and boy was it a pain in the ass, took me about a week.
First thing is first. Your going to need an external hard drive.
I used the updated files “improved-ubuntu”, which boots up into a gui.
then I installed gparted
then I created an ext4 partition on my external (actually I did a lot of trial and errors (I never got mdadm to work, I HAD TO DD /dev/md0 INSIDE THE BOOTED OS), I never succeeded in creating 1 img file that would boot (I did later, see below!) without adding any other img files in the same dir, if I had just one, it wouldn’t boot by itself, saying something about raid 1 with 1 device was unusual, but if I wanted to I could use –force, but the mdadm command wasn’t available, so I skipped that).
I even tried downgrading to 3.15 to get the “other os” option, which didn’t show up on my ps3 slim.
So the command looked like
dd /dev/md0 /dev/sda4 (my ext4 partition)
it takes a while.
Then after that. Make sure you don’t have any .img files on the root of your dev_hdd0
boot up with lv2patcher
the commands were
mount /dev/sda4 /mnt
exec switch_root /mnt /sbin/init
it will pop up with an error, but will eventually boot up into a gui off the external!
My next project is to get a limited version of grub to run from the rescue shell so I can try to boot from the ppc/ps3 ubuntu iso and install my own os from scratch.
I'm not having much luck with grub. Get messages about open firmware bios not supported/found, something to that effect.
To help the OS speed up though, I recommend assigning a pagefile to the dev/ps3db 2.1GB FAT drive that is on the internal hard drive (DON'T FORMAT IT AS SWAP! I DON'T KNOW WHAT KIND OF HARM THAT MIGHT CAUSE YOUR PS3, you can use the mkswap and swapon commands to assign it in it's native state to be a swap device). That way your external HD is ONLY being used for the OS. Also, of course mount the PS3Vram as a pagefile (which should have a higher priority number assigned to it, see my prior posts if you have questions on that). That should make up for not being able to run the OS on the internal HD, especially since you can use it's full write/read speeds for the pagefile.