root@host:/var/log/apache2# du access.log -bh 753M access.log root@host:/var/log/apache2# du access.log -h 1.2G access.log
Why is there such a huge difference in size for the same file?
There you go. from Precise Ubuntu Mangages :
So not only do you have count in MiB/GiB on the first side, but you may have a "sparse file" in front of you.
(I'm assuming here that you are using coreutil's