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Old 02-01-2010, 02:29 PM
"Robert Grasso"
Default very large difference between df and du (10 GB, hard to believe)


I have a small server running a tool (RT : perl + mysql + apache) for our support team. I stripped down everything else. The OS is
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@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.

I verified with

tune2fs -l /dev/sda1
Block count: 8703205
Reserved block count: 435160

that is, the ordinary 5%

the journal size :

debugfs -R "stat <8>" /dev/sda1


Size: 33554432 with a block size of 4096, this gives 128 MB

I rebooted on the CentOS v4.8 CD #1, started "linux rescue" :

mounting /dev/sda1, I get the same 29 GB used

e2fsck reports a clean filesystem

e2fsck -f does not reports further errors.

Does anybody have a suggestion ?

Best regards
Robert GRASSO - System engineer

CentOS mailing list

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