yum install parted -y
parted /dev/sda

(parted) unit MB print free
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 53687MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start    End      Size     Type     File system  Flags
        0.03MB   1.05MB   1.02MB            Free Space
 1      1.05MB   525MB    524MB    primary  ext4         boot
 2      525MB    10737MB  10212MB  primary               lvm
        10737MB  53687MB  42950MB           Free Space

mkpart primary ext4 10737 53687
quit
reboot



[root@ip179 ~]# parted /dev/sda
GNU Parted 2.1
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 53.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  525MB   524MB   primary  ext4         boot
 2      525MB   10.7GB  10.2GB  primary               lvm
 3      10.7GB  53.7GB  42.9GB  primary

(parted) ^C
(parted) quit
[root@ip179 ~]# pvcreate /dev/sda3
  Physical volume "/dev/sda3" successfully created
[root@ip179 ~]# vgextend VolGroup /dev/sda3
  Volume group "VolGroup" successfully extended
[root@ip179 ~]# ^C
[root@ip179 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                      8.3G  842M  7.1G  11% /
tmpfs                 498M     0  498M   0% /dev/shm
/dev/sda1             477M   52M  400M  12% /boot
[root@ip179 ~]# vgdisplay
  --- Volume group ---
  VG Name               VolGroup
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               49.50 GiB
  PE Size               4.00 MiB
  Total PE              12673
  Alloc PE / Size       2434 / 9.51 GiB
  Free  PE / Size       10239 / 40.00 GiB
  VG UUID               tp0a2o-Hkup-3V0m-01K1-udfY-Y2l2-gTMHjg

[root@ip179 ~]# resize2fs /dev/VolGroup/lv_root
resize2fs 1.41.12 (17-May-2010)
The filesystem is already 2238464 blocks long.  Nothing to do!

[root@ip179 ~]# lvextend /dev/VolGroup/lv_root /dev/sda3
  Size of logical volume VolGroup/lv_root changed from 8.54 GiB (2186 extents) to 48.54 GiB (12425 extents).
  Logical volume lv_root successfully resized.
[root@ip179 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                      8.3G  842M  7.1G  11% /
tmpfs                 498M     0  498M   0% /dev/shm
/dev/sda1             477M   52M  400M  12% /boot
[root@ip179 ~]# lvresize --extents +100%FREE --resizefs /dev/VolGroup/lv_root
[root@ip179 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                      8.3G  842M  7.1G  11% /
tmpfs                 498M     0  498M   0% /dev/shm
/dev/sda1             477M   52M  400M  12% /boot
[root@ip179 ~]#