[root@localhost dist_selfdiag]# df -h

Filesystem      Size  Used Avail Use% Mounted on

/dev/sda3        16G   14G  1.6G  90% /

tmpfs           2.0G   72K  2.0G   1% /dev/shm

/dev/sda1       283M   59M  209M  22% /boot

[root@localhost dist_selfdiag]# lsblk

NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT

sr0     11:0    1 1024M  0 rom

sda      8:0    0   20G  0 disk

├─sda1   8:1    0  300M  0 part /boot

├─sda2   8:2    0    4G  0 part [SWAP]

└─sda3   8:3    0 15.8G  0 part /

[root@localhost dist_selfdiag]# resize2fs /dev/sda3

resize2fs 1.41.12 (17-May-2010)

The filesystem is already 4125440 blocks long.  Nothing to do!

[root@localhost dist_selfdiag]# du -sh /* | sort -h

du: cannot access `/proc/19217/task/19217/fd/4': No such file or directory

du: cannot access `/proc/19217/task/19217/fdinfo/4': No such file or directory

du: cannot access `/proc/19217/fd/4': No such file or directory

du: cannot access `/proc/19217/fdinfo/4': No such file or directory

0       /proc

0       /sys

4.0K    /media

4.0K    /selinux

4.0K    /srv

8.0K    /mnt

12K     /opt

16K     /lost+found

256K    /dev

7.2M    /bin

16M     /sbin

46M     /etc

57M     /boot

62M     /home

275M    /lib

2.4G    /usr

3.0G    /tmp

3.6G    /root

3.7G    /var

[root@localhost dist_selfdiag]# fdisk /dev/sda

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

         switch off the mode (command 'c') and change display units to

         sectors (command 'u').

Command (m for help): ^C

[root@localhost dist_selfdiag]# fdisk /dev/sda

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

         switch off the mode (command 'c') and change display units to

         sectors (command 'u').

Command (m for help): d

Partition number (1-4): n

Partition number (1-4): w

Partition number (1-4): 3

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.

The kernel still uses the old table. The new table will be used at

the next reboot or after you run partprobe(8) or kpartx(8)

Syncing disks.

[root@localhost dist_selfdiag]# cated. It's strongly recommended to

>          switch off the mode (command 'c'

> ;

> ^C

[root@localhost dist_selfdiag]#

[root@localhost dist_selfdiag]# resize2fs /dev/sda3

resize2fs 1.41.12 (17-May-2010)

The filesystem is already 4125440 blocks long.  Nothing to do!

[root@localhost dist_selfdiag]#

[root@localhost dist_selfdiag]# df -h

Filesystem      Size  Used Avail Use% Mounted on

/dev/sda3        16G   14G  1.6G  90% /

tmpfs           2.0G   72K  2.0G   1% /dev/shm

/dev/sda1       283M   59M  209M  22% /boot

[root@localhost dist_selfdiag]#

[root@localhost dist_selfdiag]# resize2fs /dev/sda3

resize2fs 1.41.12 (17-May-2010)

The filesystem is already 4125440 blocks long.  Nothing to do!

[root@localhost dist_selfdiag]# df -h

Filesystem      Size  Used Avail Use% Mounted on

/dev/sda3        16G   14G  1.6G  90% /

tmpfs           2.0G   72K  2.0G   1% /dev/shm

/dev/sda1       283M   59M  209M  22% /boot

[root@localhost dist_selfdiag]# ^C

[root@localhost dist_selfdiag]# fdisk -l /dev/sda

Disk /dev/sda: 21.5 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00041c8e

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          39      307200   83  Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2              39         557     4161536   82  Linux swap / Solaris

Partition 2 does not end on cylinder boundary.

[root@localhost dist_selfdiag]# ^C

[root@localhost dist_selfdiag]# fdisk /dev/sda

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

         switch off the mode (command 'c') and change display units to

         sectors (command 'u').

Command (m for help): n

Command action

   e   extended

   p   primary partition (1-4)

p

Partition number (1-4): 3

First cylinder (557-2610, default 557): 2610

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.

The kernel still uses the old table. The new table will be used at

the next reboot or after you run partprobe(8) or kpartx(8)

Syncing disks.

[root@localhost dist_selfdiag]# resize2fs /dev/sda3

resize2fs 1.41.12 (17-May-2010)

The filesystem is already 4125440 blocks long.  Nothing to do!

[root@localhost dist_selfdiag]# mkfs.ext4 /dev/sda3

mke2fs 1.41.12 (17-May-2010)

/dev/sda3 is mounted; will not make a filesystem here!

[root@localhost dist_selfdiag]# resize2fs /dev/sda3

resize2fs 1.41.12 (17-May-2010)

The filesystem is already 4125440 blocks long.  Nothing to do!

[root@localhost dist_selfdiag]#

[root@localhost dist_selfdiag]# mount /dev/sda3 /mnt

[root@localhost dist_selfdiag]# df -h

Filesystem      Size  Used Avail Use% Mounted on

/dev/sda3        16G   14G  1.6G  90% /

tmpfs           2.0G   72K  2.0G   1% /dev/shm

/dev/sda1       283M   59M  209M  22% /boot

/dev/sda3        16G   14G  1.6G  90% /mnt

[root@localhost dist_selfdiag]# ^C

[root@localhost dist_selfdiag]# partprobe /dev/sda

Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy).  As a result, it may not reflect all of your changes until after reboot.

[root@localhost dist_selfdiag]# resize2fs /dev/sda3

resize2fs 1.41.12 (17-May-2010)

The filesystem is already 4125440 blocks long.  Nothing to do!

[root@localhost dist_selfdiag]# reboot

[root@localhost dist_selfdiag]#

Broadcast message from ****@*********.localdomain

        (/dev/pts/0) at 11:58 ...

The system is going down for reboot NOW!