I have converted a KVM instance using LVM as storage to QCOW2 format and imported the image into OpenStack. The image is running fine. When I resize the image with custom flavor to increase the storage space. The image storage is not getting expanded. The resized image shows extra space added when executing following command:

fdisk -l | grep vda

But the vda1 for / has only 10 GB. How do I resize the instance for high storage especially LVM converted to QCOW2?