On Thu, Apr 16, 2015 at 4:13 PM, Moez Roy <moez.roy@xxxxxxxxx> wrote:
> Copying more than 500 MB crashes Fedora Live CD even though there is
> sufficient RAM.
>
> It doesn't matter how much RAM your system has, once you copy more
> than 500 MB you will get stuff like "Input/output error" or just plain
> crashes like "Segmentation fault".
>
> Why does this happen?
I think I figured out why this happens.
The file /usr/lib/dracut/modules.d/90dmsquash-live/dmsquash-live-root.sh
seems to create a 500MB overlay:
dd if=/dev/null of=/overlay bs=1024 count=1 seek=$((512*1024))
2> /dev/null
if [ -n "$setup" -a -n "$readonly_overlay" ]; then
RO_OVERLAY_LOOPDEV=$( losetup -f )
losetup $RO_OVERLAY_LOOPDEV /overlay
else
losetup $OVERLAY_LOOPDEV /overlay
fi
fi
Wouldn't it be more efficient if this was tmpfs instead?
This also affects installing applications in the live environment
where the installed size is more than 500MB.
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