pfSense

System with RRD graphs enabled.
System has more than 3 interfaces.

Update from 2.0.x to 2.1 fails with disk full in /tmp/
because while converting the rrd database the old files are not removed.

References: http://forum.pfsense.org/index.php?topic=66628.0

My suggested Solution is to remove the xml export files after conversion.

in file /etc/inc/upgrade_config.inc
at function upgrade_080_to_081()

after line:

    unset($xml);

insert the 2 new lines:

    unlink_if_exists( "{$g['tmp_path']}/{$xmldump}" );
    unlink_if_exists( "{$g['tmp_path']}/{$xmldumpnew}" );