There are some cases when we want to extend the size of LVM partition but if there is no free space available in the Volume group , then first we have to extend the volume group , to extend the volume group add new disks in volume group using vgextend command.
If there is no free disk available on the linux box , then you can ask the storage team to assign new disk to the server.

Scenario : Suppose We want to extend the size of /home , but there is no free in the volume group .

[root@cloud ~]# df -h /home/
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_cloud-LogVol00
16G   16G   41M 100% /home

[root@cloud ~]# vgdisplay vg_cloud
— Volume group —
VG Name                           vg_cloud
System ID
Format                                lvm2
Metadata Areas                1
Metadata Sequence No   8
VG Access                          read/write
VG Status                           resizable
MAX LV                               0
Cur LV                                 3
Open LV                             3
Max PV                               0
Cur PV                                1
Act PV                                1
VG Size                              27.01 GiB
PE Size                               4.00 MiB
Total PE                              6915
Alloc PE / Size                   6915 / 27.01 GiB
Free  PE / Size             0 / 0
VG UUID                            1R89GB-mIP2-7Hgu-zEVR-5H02-7GdB-Ufj7R4

Step:1  Create the Physical Volume on new disk
Check the new disk using ‘ fdisk -l ‘ command and create the physical volume, in my case new disk is ‘/dev/sdb’
root@cloud ~]# pvcreate /dev/sdb
Physical volume “/dev/sdb” successfully created

Step:2 Now extend the Size of Volume Group using vgextend.
[root@cloud ~]# vgextend vg_cloud /dev/sdb
Volume group “vg_cloud” successfully extended
Step:3 Verify the size of Volume Group.
[root@cloud ~]# vgdisplay vg_cloud
— Volume group —
VG Name                           vg_cloud
System ID
Format                               lvm2
Metadata Areas                2
Metadata Sequence No   9
VG Access                          read/write
VG Status                           resizable
MAX LV                               0
Cur LV                                 3
Open LV                              3
Max PV                                0
Cur PV                                 2
Act PV                                  2
VG Size                               37.04 GiB
PE Size                                4.00 MiB
Total PE                               9481
Alloc PE / Size                    6915 / 27.01 GiB
Free  PE / Size             2566 / 10.02 GiB
VG UUID                             1R89GB-mIP2-7Hgu-zEVR-5H02-7GdB-Ufj7R4

Note: As you can see Available or Free PE / size is 10.02GB.

Step:4 Extend the lvm size using lvextend command
[root@cloud ~]# lvextend -L +5G /dev/mapper/vg_cloud-LogVol00
Extending logical volume LogVol00 to 21.25 GiB
Logical volume LogVol00 successfully resized

Step:5 Run the resize2fs command
[root@cloud ~]# resize2fs /dev/mapper/vg_cloud-LogVol00
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/vg_cloud-LogVol00 is mounted on /home; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 2
Performing an on-line resize of /dev/mapper/vg_cloud-LogVol00 to 5569536 (4k) blocks.
The filesystem on /dev/mapper/vg_cloud-LogVol00 is now 5569536 blocks long.

Step:6 Verify the filesystem size
[root@cloud ~]# df -h /home/
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_cloud-LogVol00
21G   16G  4.8G  77% /home

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