How to extend CentOS partition


1) Identify the device name, which is by default /dev/sda, and confirm the new size by running the command:

# fdisk -l

2) Get list of partitions for /dev/sda device:

# ls -al /dev/sda*

brw-rw---- 1 root disk 8, 0 Dec 29 15:32 /dev/sda
brw-rw---- 1 root disk 8, 1 Dec 29 15:32 /dev/sda1
brw-rw---- 1 root disk 8, 2 Dec 29 15:32 /dev/sda2

3) Create new primary partition

# fdisk /dev/sda

Then type:
  n (enter) [create new partition]
  p (enter) [primary partition]
  3 (enter) [next available number from listed /dev/sda partitions in 2)
  (enter)   [start cylinder]
  (enter to use all available physical space) or specify size in +cylinders, +size{K,M,G}
  t (enter) [change partition type]
  3 (enter) [selecting /dev/sda3 partition]
  8e (enter) [this sets partition type to Linux LVM or type L then enter to see list of types] 
  w (enter)

  The partition table has been altered!

4) Reboot Centos 6.X then log back in with root privileges

# reboot

5) Check the new partition is ready and type ‘8e’:

# fdisk -l

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        2089    16264192   8e  Linux LVM
/dev/sda3            2089        3916    14678054   8e  Linux LVM

6) Create physical volume:

# pvcreate /dev/sda3

Physical volume "/dev/sda3" successfully created

7) Find out volume group name:

# vgdisplay

--- Volume group ---
VG Name               vg_app1

8) Extend the physical volume:

# vgextend vg_app1 /dev/sda3

Volume group "vg_app1" successfully extended

9) Extend the existing volume group to the new physical volume (+100%FREE can be altered to desired size). Since we are extending root partition hence pointing to lv_root in vg_app1 volume group.

# lvextend -l +100%FREE /dev/vg_app1/lv_root

Size of logical volume vg_app1/lv_root changed from 11.63 GiB (2978 extents) to 25.63 GiB (6561 extents).
Logical volume lv_root successfully resized

10) Resize logical root volume:

# resize2fs /dev/vg_app1/lv_root

resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg_app1/lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 2
Performing an on-line resize of /dev/vg_app1/lv_root to 6718464 (4k) blocks.
The filesystem on /dev/vg_app1/lv_root is now 6718464 blocks long.

Note: Use ext2online instead of resize2fs if it is a Red Hat virtual machine.

11) Check available space:

# df -h

Filesystem            Size  Used Avail Use% Mounted on
                      26G   10G   14G  42% /
tmpfs                 9.8G     0  9.8G   0% /dev/shm
/dev/sda1             477M   88M  364M  20% /boot


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