Hi all

I am newbie running Slackware-10.2

A quick question
Can any one please tell me why the two commands are giving results??

******************
bash-3.00$ df -h /boot
Filesystem Size Used Avail Use% Mounted on
/dev/hda6 48M 37M 11M 78% /boot
bash-3.00$ du -hs /boot
4.2M /boot
bash-3.00$
******************

Thanks

The du command only outputs the usage of the files that exist there. The df output includes space 'reserved' for the journaling filesystem (ext3, reiserfs, etc.).

Thank man

I had no idea that journaling filesystem or any filesystem required space, but compared to the size of the partition, it is a lot of space don't you think, I mean practically more than half the partion space is gone!! Is it OK????

Thank

It's allocated space only. You still have 43.8M left on /boot

Isee...hummmm :-)

Thanks a lot guys

one more thing guys

how do you explain this, du command is showing more space usage than the df command

bash-3.00$ df -h /opt
Filesystem Size Used Avail Use% Mounted on
/dev/hda8 1.2G 676M 470M 60% /opt
bash-3.00$ du -hs /opt
698M /opt
bash-3.00$

OK I have reformatted and reinstalled Slackware to flush out any problem but it is still the same

bash-3.00$ df -h /boot
Filesystem Size Used Avail Use% Mounted on
/dev/hda6 48M 37M 11M 78% /boot
bash-3.00$ du -hs /boot
4.2M /boot
bash-3.00$ df -h /opt
Filesystem Size Used Avail Use% Mounted on
/dev/hda8 1.2G 676M 470M 60% /opt
bash-3.00$ du -hs /opt
698M /opt
bash-3.00$


Can someone please please tell me what is goingon....PLEASE

Thanks

It could be that a process has deleted a file but not closed all of the file descriptors pointing to it. This is unlikely in your case since you've formatted the disk and still have the problem, but try running `lsof +aL1 /boot` and see if anything turns up.

There are a couple of links I tried to post about open files, but I don't have 5 previous posts under my belt...

Thanks everyone for your time

I have found the solution from another group & I am describing it below, it is going to be a bit long, so if you are not interested you can skip it now.

Thanks

For my first case

******************
bash-3.00$ df -h /boot
Filesystem Size Used Avail Use% Mounted on
/dev/hda6 48M 37M 11M 78% /boot
bash-3.00$ du -hs /boot
4.2M /boot
bash-3.00$
******************

The solution provider suggested this

************
I'm guessing you're using ReiserFS with the default 32MB journal.
************

and was he was right, it was ReiserFS, and you will notice that the difference between the df & du result is approximately 32MB. Makes sense... so I tried it for all my partitions

*******************
bash-3.00# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda5 283M 104M 179M 37% /
/dev/hda6 48M 37M 11M 78% /boot
/dev/hda7 283M 47M 237M 17% /home
/dev/hda8 1.2G 676M 470M 60% /opt
/dev/hda9 283M 33M 250M 12% /root
/dev/hda10 283M 33M 251M 12% /tmp
/dev/hda11 2.4G 1.6G 810M 67% /usr
/dev/hda12 957M 50M 907M 6% /var
bash-3.00# du -hs /boot /home /opt /root /tmp /usr /var
4.2M /boot
16M /home
698M /opt
1.2M /root
49K /tmp
1.7G /usr
19M /var
bash-3.00#
******************

You will notice that all the results have an approximate difference of 32MB with the exception of /opt & /usr (the 2 most largest partitions). This is where the solution to my second problem comes in

For my second case

***********************
bash-3.00$ df -h /boot
Filesystem Size Used Avail Use% Mounted on
/dev/hda6 48M 37M 11M 78% /boot
bash-3.00$ du -hs /boot
4.2M /boot
bash-3.00$ df -h /opt
Filesystem Size Used Avail Use% Mounted on
/dev/hda8 1.2G 676M 470M 60% /opt
bash-3.00$ du -hs /opt
698M /opt
bash-3.00$
**********************
The solution provider suggested this

*****************
ReiserFS does tail packing, which means that it can use one disk block
for storing the last, incomplete blocks of two different files if they
both fit.

du doesn't know anything about tail packing and works on the basis of
how many blocks each file spans.

With ReiserFS you may find du is more accurate if you get it to ignore
block sizes, eg:
du -bhs /opt
*****************
and sure enough this time all the du results were smaller than df results

******************
bash-3.00# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda5 283M 104M 179M 37% /
/dev/hda6 48M 37M 11M 78% /boot
/dev/hda7 283M 47M 236M 17% /home
/dev/hda8 1.2G 676M 470M 60% /opt
/dev/hda9 283M 33M 250M 12% /root
/dev/hda10 283M 33M 251M 12% /tmp
/dev/hda11 2.4G 1.6G 810M 67% /usr
/dev/hda12 957M 50M 907M 6% /var
bash-3.00# du -bhs /boot /home /opt /root /tmp /usr /var
4.2M /boot
14M /home
617M /opt
281K /root
6.8K /tmp
1.5G /usr
18M /var
bash-3.00#
****************

Any comments or suggestion will be welcomed