Fedora13 showed 128 TB /proc/kcore on 2GB RAM
davidsen at tmr.com
Wed Jul 14 21:12:01 UTC 2010
Chen, Helen Y wrote:
> I am running Fedora 13 with the 184.108.40.206-112-2.2 kernel, and am trying
> to make an ISO image of my hard disk for other use. Unfortunately
> “mkisofs” failed because /proc/kcore exceeded its 4GB file size limit.
> In fact, the size of the kcore on my system is shown to be 128TB, and
> the machine itself only contains 2GB of RAM. Has anyone experienced the
> same problem? BTW, the kcore files on my redhat machines reflect the
> actual RAM size as it should be. Also, does anyone know why “mkisofs”
> even tries to copy a virtual file into the ISO image it is creating?
If "other use" means non-Linux, you will have to exclude the things others have
mentioned. You will lose some information going to ISO-9669 format, you may not
care. If you want a real backup, loop mount a 4G file with an ext2 and copy
everything to that, preserving ownership, etc. Then unmount and burn to a DVD.
Linux will be happy to mount an ext2 DVD and all permissions and ACLs will be
Note, I'm just typing this in, engage brain before copying!
# cd /tmp
# dd if=/dev/zero bs=1M count=4k of=bkup.ext2
# mke2fs [options] bkup.ext2
# mount -o loop bkup.ext2 /mnt/loop
# for n in / /boot /home; do cp -ax $n /mnt/loop/; done
# umount /mnt/loop
# growisofs -Z /dev/dvd=bkup.ext2
I do similar stuff, although if I really care about the data, I often make the
loop file smaller so I can add dvdisaster software ECC to the image.
Bill Davidsen <davidsen at tmr.com>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot
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