[CentOS] very large difference between df and du (10 GB, hard to believe)
Todd.Denniston at tsb.cranrdte.navy.mil
Mon Feb 1 16:00:27 UTC 2010
Robert Grasso wrote, On 02/01/2010 10:29 AM:
> CentOS 4.8. I noticed a difference between df and du which is hard to believe :
> according to df, I am using 29 GB
> [root at cedrat-rt ~]$ df -h
> Filesystem Size Used Avail Use% Mounted on
> /dev/sda1 33G 29G 2.8G 92% /
> none 506M 0 506M 0% /dev/shm
> (there are no other partitions - ok, I could have partitioned it a bit more)
> but according to
> du -kshxc /*
> my largest directory is /var (because of mysql) and the grand total is
> 19 GB
> I have a 10 GB difference between both outputs.
> e2fsck reports a clean filesystem
> Does anybody have a suggestion ?
<commentary on options>
-k is 1k block size
-h is print human readable (with appropriate extensions)
which ever of them is last wins for display... I suggest only using one though, to reduce possible
for large measurements I usually use -m,
of course it could be fun to use --block-size=1024M instead, i.e., 1G.
</commentary on options>
I too would expect them to come close to matching, unless you have a lot of 3.5k (or less) files in
a 4k inode file system.
du -shxc --count-links /*
du -shxc --apparent-size /*
du -shxc --count-links --apparent-size /*
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