On 17 April 2015 at 15:45, Brett Parker iDunno@sommitrealweird.co.uk wrote:
OK - So, the general reason for df and du to disagree is if there was a huge file, and the file was deleted *but* something still had a handle open on it, the space will not have been released...
It's consistent over reboots and appears to have started after a ~2GB file was deleted via Ext2Fsd from Windows.
It's as if the space is still allocated but no longer in any directory listing, similar to what would happen if an open file was deleted but apparently different.
You probably want to try something akin to:
sudo lsof | grep DEL
Nothing other than a few entries relating to /dev/zero.