LVM

#Typed parted in console 
#it will take you into parted shell 
parted

#select device to be parted using the following command 

select devicename
#Ex select /dev/vda
#vda represents virtual device 
#sda represents physical storage 

#p is for display 
#print/p will display the partitions done and memory available in the disc

print
(parted) p                                                               
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 21.5GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  211MB   210MB   primary  ext4         boot
 2      211MB   10.7GB  10.5GB  primary               lvm

(parted) mkpart    #to make the partition                                                       
Partition type?  primary/extended? primary # type of partition                                
File system type?  [ext2]?                  # filesystem type , we need ext4 but it is not supported by default                              
Start? 10.7GB                     # starting point of the partitiion                                       
End? 21.5GB                       #ending point of the partition                                        
Warning: WARNING: the kernel failed to re-read the partition table on /dev/vda (Device or resource busy).  As a result, it may not reflect all of your changes until after
reboot.
(parted) q                     #to quit from the parted shell                                            
[root@workernode3 ~]# reboot    # need to reboot to reflect the changes 

Steps to add the created partition to a logical volume 
pvdisplay # displays the current physical volumes and volume group details 

  --- Physical volume ---
  PV Name               /dev/vda2
  VG Name               VolGroup00
  PV Size               9.80 GiB / not usable 23.00 MiB
  Allocatable           yes (but full)
  PE Size               32.00 MiB
  Total PE              313
  Free PE               0
  Allocated PE          313
  PV UUID               2I4UJJ-nEny-zaJb-V1an-knNU-0cYe-Rw6sTk
  
[root@workernode3 ~]# pvcreate /dev/vda3  # physical volume create , to create a new physical volume 
  Physical volume "/dev/vda3" successfully created
[root@workernode3 ~]#
[root@workernode3 ~]#
[root@workernode3 ~]# vgdisplay # virtual group display to see the details of the group
  --- Volume group ---
  VG Name               VolGroup00
  System ID            
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               9.78 GiB
  PE Size               32.00 MiB
  Total PE              313
  Alloc PE / Size       313 / 9.78 GiB
  Free  PE / Size       0 / 0  
  VG UUID               7VjBKK-vWvf-Faxz-cAPT-gLjv-3gd2-RQadCz
vgextend VolGroup00 /dev/vda3 # extend the logical volume with the new disk space
  Volume group "VolGroup00" successfully extended
[root@workernode3 ~]# pvscan # to verify whether it is added to the group or not
  PV /dev/vda2   VG VolGroup00   lvm2 [9.78 GiB / 0    free]
  PV /dev/vda3   VG VolGroup00   lvm2 [9.97 GiB / 9.97 GiB free]
  Total: 2 [19.75 GiB] / in use: 2 [19.75 GiB] / in no VG: 0 [0   ]
[root@workernode3 ~]# lvextend /dev/VolGroup00/LogVol00 /dev/vda3# logical volume extend 
  Extending logical volume LogVol00 to 18.25 GiB
  Logical volume LogVol00 successfully resized
[root@workernode3 ~]# resize2fs /dev/VolGroup00/LogVol00 # resizing the volume with the new space and die system
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 2
Performing an on-line resize of /dev/VolGroup00/LogVol00 to 4784128 (4k) blocks.
The filesystem on /dev/VolGroup00/LogVol00 is now 4784128 blocks long.

[root@workernode3 ~]# df -h
Filesystem                       Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00   18G  1.9G   16G  12% /
tmpfs                            939M     0  939M   0% /dev/shm
/dev/vda1                        194M   34M  151M  19% /boot