LinuxQuestions.org - [SOLVED] disk size mismatch using df

Hi,
This is not really a problem, but I am curious!

When I run df command, the sum of free and used space doesn't tally up to total space. Now I found an explanation in this thread:
http://www.linuxquestions.org/questi...n-size-316091/
The amount of "reserved" space seems a little too high as OP of the thread had commented, but may be that's what needed.

Now my question is is there a way to change/specify this amount of "reserved" space manually?

Also is there a way where you can see the actual disk usage for every mounted partition including the hidden "reserved" space? Because sometimes this mismatch makes the output of df very confusing!

I am attaching output of df, and fdisk from my NFS server. The amount of reserved space seems to be close to 5% of the total partition size.

Code:

[root@cretaceous ~]# df -a

Filesystem          1K-blocks      Used Available Use% Mounted on

/dev/sda2            14877092  3788520  10320668  27% /

proc                        0        0        0  -  /proc

sysfs                        0        0        0  -  /sys

devpts                      0        0        0  -  /dev/pts

/dev/sda5            1399271668 1230547024  96499220  93% /export

/dev/sda1              101086    33459    62408  35% /boot

tmpfs                  1027440        0  1027440  0% /dev/shm

none                        0        0        0  -  /proc/sys/fs/binfmt_misc

sunrpc                      0        0        0  -  /var/lib/nfs/rpc_pipefs

nfsd  

[root@cretaceous ~]# fdisk -l



Disk /dev/sda: 1499.2 GB, 1499212021760 bytes

255 heads, 63 sectors/track, 182268 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes



  Device Boot      Start        End      Blocks  Id  System

/dev/sda1  *          1          13      104391  83  Linux

/dev/sda2              14        1925    15358140  83  Linux

/dev/sda3            1926        2435    4096575  82  Linux swap / Solaris

/dev/sda4            2436      182268  1444508572+  5  Extended

/dev/sda5            2436      182268  1444508541  83  Linux

[root@cretaceous ~]# cat /etc/fstab 

LABEL=/                /                      ext3    defaults        1 1

LABEL=/export          /export                ext3    defaults        1 2

LABEL=/boot            /boot                  ext3    defaults        1 2

tmpfs                  /dev/shm                tmpfs  defaults        0 0

devpts                  /dev/pts                devpts  gid=5,mode=620  0 0

sysfs                  /sys                    sysfs  defaults        0 0

proc                    /proc                  proc    defaults        0 0

LABEL=SWAP-sda3        swap                    swap    defaults        0 0

                      0        0        0  -  /proc/fs/nfsd