Need the steps to increase vApp 14.1 disk space

Document ID : KB000095719
Last Modified Date : 29/08/2018
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Question:
The virtual disk assigned to the vapp is exhausted. How do I increase this under vmware esx?
Answer:
vApp Admin guide supplies a resizeDisk script/command We do not provide access to source code. Let me briefly describe the logic of the resizeDisk command:
• The vApp uses a single root volume (/) which is formatted with ext4 filesystem over LVM.
• The vApp’s filesystem is located on a logical volume (LV) named lv_root
• This LV is contained in a volume group (VG) named vg_ca-vapp and mounted on /.
• There are 2 options for resizing the root volume:
   o resizeDisk
     The ESX administrator extends the existing virtual disk
     The command extends the existing partition (a reboot may be required).
     The PV will be extended spanning the entire partition.
     The LV will be extended with the PV’s additional space
     The filesystem on the root volume will be extended.
   o addDisk
     The ESX administrator adds a new virtual disk.
     The command creates a new partition spanning the entire disk.
     It then creates a PV spanning the entire partition.
     The VG will be extended with the newly created PV.
     The LV will be extended with the additional space.
     The filesystem on the root volume will be extended.