Huge amounts of unexplained used space in the root filesystem are almost always due to files hidden under an active mount point, perhaps due to making a backup while nothing was mounted on /backup/DCA-TST . Try this:
Code:
mkdir /tmp/tmproot
mount --bind / /tmp/tmproot
du -sh /tmp/tmproot/*
That allows you to work with the root filesystem as though nothing were mounted on any of the mount point directories. If you see large amounts of space used there, you can look at the files and see what should be moved to its proper location or perhaps removed entirely.
After you're done cleaning up,
Code:
umount /tmp/tmproot
rmdir /tmp/tmproot
'df -h' wrong result, du show perfect one
