How to extend Root Partition in LVM

I had an adhoc plan to install latest version of OEM13C on my existing RAC VM’s instead of creating a dedicated machine for OEM. But, Root filesystem space about to exhaust and I felt there is no room for one Repository DB. Initially I added 20GB of normal disks to each of the VM’s and Just followed the below steps to extend the root partition.

[root@vm2 ~]# df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/vg_vm1-lv_root

                       36G   25G  8.6G  75% /

tmpfs                  12G  1.6G   11G  14% /dev/shm

/dev/sda1             485M  110M  351M  24% /boot

Root partition has only 8.6 GB of free space; I am going to extend this now.

Newly added disk sdl

Disk /dev/sdl: 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: 0x00000000

Logical Volume information

[root@vm2 ~]# lvs

  LV      VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert

  lv_root vg_vm1 -wi-ao---- 35.57g

  lv_swap vg_vm1 -wi-ao----  3.94g

Follow the below steps to create partition on the new disk and change partition type from Linux to LVM(8e)

[root@vm2 ~]# fdisk /dev/sdl

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel

Building a new DOS disklabel with disk identifier 0x6d8ac917.

Changes will remain in memory only, until you decide to write them.

After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

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):

Value out of range.

Partition number (1-4):

Value out of range.

Partition number (1-4): 1

First cylinder (1-2610, default 1):

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610):

Using default value 2610

Command (m for help): t

Selected partition 1

Hex code (type L to list codes): 8e

Changed system type of partition 1 to 8e (Linux LVM)

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

My already mounted filesystem is of type ext4.  So, formatting the newly created partition using the below command.

[root@vm2 ~]# mkfs.ext4 /dev/sdl1

mke2fs 1.43-WIP (20-Jun-2013)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

1310720 inodes, 5241198 blocks

262059 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=4294967296

160 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,

        4096000

Allocating group tables: done

Writing inode tables: done

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

Initialize the newly created partition as physical volume

[root@vm2 ~]# pvcreate /dev/sdl1

  Physical volume "/dev/sdl1" successfully created

Check the Volume Groups using the below command

[root@vm2 ~]# vgs

  VG     #PV #LV #SN Attr   VSize  VFree

  vg_vm1   1   2   0 wz--n- 39.51g    0

Extend the new Volume Group with new Physical Volume

[root@vm2 ~]# vgextend vg_vm1 /dev/sdl1

  Volume group "vg_vm1" successfully extended

Extend the Logical Volume (lv_root) with all Free space of VG.

[root@vm2 ~]# lvextend -l +100%FREE /dev/vg_vm1/lv_root

  Size of logical volume vg_vm1/lv_root changed from 35.57 GiB (9106 extents) to 55.56 GiB (14224 extents).

  Logical volume lv_root successfully resized.

Finally Resize the Filesystem

[root@vm2 ~]# resize2fs /dev/vg_vm1/lv_root

resize2fs 1.43-WIP (20-Jun-2013)

Filesystem at /dev/vg_vm1/lv_root is mounted on /; on-line resizing required

old_desc_blocks = 3, new_desc_blocks = 4

Performing an on-line resize of /dev/vg_vm1/lv_root to 14565376 (4k) blocks.

The filesystem on /dev/vg_vm1/lv_root is now 14565376 blocks long.

Verify the filesystem size

[root@vm2 ~]# df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/vg_vm1-lv_root

                       55G   25G   28G  48% /

tmpfs                  12G  1.6G   11G  14% /dev/shm

/dev/sda1             485M  110M  351M  24% /boot

[root@vm2 ~]# lvs

  LV      VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert

  lv_root vg_vm1 -wi-ao---- 55.56g

  lv_swap vg_vm1 -wi-ao----  3.94g

[root@vm2 ~]# vgs

  VG     #PV #LV #SN Attr   VSize  VFree

  vg_vm1   2   2   0 wz--n- 59.50g    0