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I'm running the linux distro on my server.When i want to verify the size of the disk, i'm issuing this commnand to get the output.

 df -h

But it does not produce ANY output.Strangely enough when i'm issuing other command such as fdisk -l or du -h it can show output normally.

Does anyone now why is this happening?Thanks.

edit:

here is the output of cat /etc/fstab

 none     /dev/pts       devpts   rw   0     0

and this is for mount command

 none on /dev/pts type devpts (rw)
 none on /proc/sys/fs/binfmt_misc tpe binfmt_misc  (rw)

edit(2):

here is the output of cat /proc/mounts

 /dev/vzfs / vzfs rw,relatime,usrquota,grpquota 0 0
 proc /proc proc rw,relatime 0 0
 sysfs /sys sysfs rw,relatime 0 0
 none /dev/tmpfs rw,relatime 0 0
 none /dev/pts devpts rw,relatime 0 0
 none /proc/sys/fs/binfmt_misc binfmt_msc rw,relatime 0 0
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Which distro? How about df without -h? Are you running as root or sudo permission? –  quanta Sep 12 '12 at 7:38
    
@quanta my distro is centos.I'm running as root.All the command df is not working.. –  user119720 Sep 12 '12 at 7:45
2  
Please post your /etc/fstab file and also the output of the mount command. –  ramruma Sep 12 '12 at 8:21
    
df reads /etc/mtab, could you show us this file? Both fdisk and du do something completely different. –  scai Sep 12 '12 at 8:31
1  
user119720, you've asked ten questions on SF, nearly all of which have one or more answer, but you've accepted an answer to only three. May I suggest that you review your older questions and see if you can improve your accept rate? It will make more people likely to answer future questions. –  MadHatter Sep 12 '12 at 9:42

2 Answers 2

up vote 4 down vote accepted

How about this:

$ \df

\ to ignore df alias.


UPDATE

here is the output of cat /proc/mounts

 /dev/vzfs / vzfs rw,relatime,usrquota,grpquota 0 0

/dev/vzfs --> looks like you're running OpenVZ (check by using virt-what). And if so, root filesystem is mounted by the host system, not the guest, therefore, there is no / in the /etc/mtab and df shows nothing. To fix, link /etc/mtab to /proc/mounts:

rm -f /etc/mtab
ln -s /proc/mounts /etc/mtab

Source: http://wiki.openvz.org/Gentoo_template_creation#Make_.2Fetc.2Fmtab_a_symlink_to_.2Fproc.2Fmounts

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nope..its not working.sorry –  user119720 Sep 12 '12 at 8:02
    
@user119720: updated my answer. –  quanta Sep 12 '12 at 9:47
    
thanks..altough i'm not tested this yet,but you've already point me to the right direction.i will check out this first thing in the morning. –  user119720 Sep 12 '12 at 10:14

It may be that you are not running the correct df; perhaps there is a badly-named alias or shellscript in your path. Run which df to check.

If you are running the correct df, then perhaps it has been corrupted or overwritten. Run rpm -qf $(which df) to see which package owns df, and then run rpm -V packagename or rpm -V $(rpm -qf $(which df)) to see if it has changed since installation.

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i've already run which df and it shows me this path : /bin/df when i'm running rpm -qf $(which df) it show me this output: coreutils-5.97-34.el5_8.1 and lastly when i'm running rpm -V $(rpm -qf $(which df)) ,it doesn't show me any output and neither the df command is working –  user119720 Sep 12 '12 at 8:14
    
If you run strace df, is there anything obviously wrong? –  ramruma Sep 12 '12 at 8:22

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