Dev1 Galaxy Forum / HOWTO: Bypass the 4GB filesize limit in Refractasnapshot

Re: HOWTO: Bypass the 4GB filesize limit in Refractasnapshot

dummy@example.com (golinux) — Mon, 22 Oct 2018 01:22:17 +0000

Well . . . I have good news to report. I have been unable to create an iso with refractasnapshot for a very long time despite excluding ALL of my /home directory because the iso were always too big. So fsmithred and I decided to test your discovery. He instructed me to change line 1010 from this:

 xorriso -as mkisofs -r -J -joliet-long -l ${isohybrid_opt} \

To this:

 xorriso -as mkisofs -r -J -joliet-long -l ${isohybrid_opt} -iso-level 3 \

It took refracta-snapshot-gui a very long time to copy and squash the files since I had deleted the work directory but eventually it finished with a 4.9GB iso.

Then it was time to try it in qemu. I was delighted to see the boot process working as usual!!!

Now I need to redo the exclude list to include a basic home structure and perhaps delete a few things elsewhere starting with avahi.

I am overjoyed that I can now use refractasnapshot again. And this is also a milestone improvement for refracta! Thank you, thank you alphalpha!!!

Re: HOWTO: Bypass the 4GB filesize limit in Refractasnapshot

dummy@example.com (fsmithred) — Sun, 21 Oct 2018 17:00:18 +0000

Thanks! Added to my TODO notes. You just saved me from writing a bunch of code to make a live-usb from a snapshot work directory for cases where the iso is too big.

HOWTO: Bypass the 4GB filesize limit in Refractasnapshot

dummy@example.com (alphalpha) — Sat, 13 Oct 2018 18:00:50 +0000

Hello Everyone

I finally found a way to make to make ISO snapshots that can be larger than 4GB.
I had this problem for a long time that i would get an Error during the snapshot progress because i have a lot of packages installed on my system.
I know some folks have had the same problem so i thought i'd share the solution to this.

For this to work one has to modify the xorriso command in /usr/bin/refractasnapshot,
my code may differ from your version, the important thing is to add the -iso-level 3 option

xorriso -as mkisofs -r -J -joliet-long -l -iso-level 3 -isohybrid-mbr /usr/lib/ISOLINUX/isohdpfx.bin -partition_offset 16 -V "$volid"  -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -o "$iso_dir"/"$filename" live/

and thats all
i now have a 4.2 GB large ISO file