strange df output

James Miller · 04-13-2007, 09:08 PM

Hi,

I just installed Slackware 11 on an IBM Thinkpad X30. Everything works and seemed ok till I did "df -h". Here's the output:

Code:

bash-3.1$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda1              37G  3.6G   31G  11% /

or more detailed

Code:

bash-3.1$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda1             37846348   3759016  32133832  11% /

37 total, 3.6 used, 31 available?????

I did an fsck.ext3 (it's an ext3 fs) and it doesn't find any bad blocks. I've never come across something like that. Any ideas? Or is this something ext3-specific (never used ext3 before)?

H_TeXMeX_H · 04-13-2007, 10:02 PM

don't expect the numbers to add up. The filesystem itself reserves some space, and I'm sure df is not accurate either.

ludist · 04-14-2007, 02:56 AM

That's funny, I never noticed that:

Code:

Filesystem            Size  Used Avail Use% Mounted on
/dev/hda1             3.8G  3.5G  126M  97% /
/dev/hda6             9.4G  8.7G  234M  98% /mnt/1g
/dev/rd/0              16M  4.1M   12M  27% /mnt/rd0

Hyakutake · 04-14-2007, 08:59 AM

Mine gives correct numbers:

Code:

bash-3.1$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda3              14G  5.0G  9.1G  36% /
/dev/hda4              41G   28G   13G  69% /home

Your HD has some hole on it

pdw_hu · 04-14-2007, 10:33 AM

Ext3 reserves some space automatically. It can be overriden (tho not recommended) with tune2fs -m
I've it at 0%, but i never fill my HD. Be cautious with it.

michaelk · 04-14-2007, 10:56 AM

By default when an ext2/3 filesystem is created 5% is reserved for root user. This space is supposed to reduce fragmentation as well as allow root to login if the filesystem becomes 100% full. As posted this space does not show up as used and can be changed easily.

Road_map · 04-14-2007, 11:03 AM

Mine too

Code:

/dev/hda2              50G   29G   22G  58% /mnt/wins-d
/dev/hdb2              23G   11G   13G  45% /mnt/wins-f

or not

H_TeXMeX_H · 04-14-2007, 12:52 PM

Here is mine:

Code:

Filesystem            Size  Used Avail Use% Mounted on
/dev/hda1              54G   30G   25G  55% /

30 + 25 = 55 != 54

James Miller · 04-14-2007, 01:24 PM

Thanks all!

tune2fs -m 0 /dev/hda1 did the trick

pdw_hu · 04-16-2007, 12:41 AM

Just don't fill the partition (especially the root partition)