I have a dynamically allocated virtual disk, which was initially 40GB.
I increased the disk size from 40 GB to 100GB first and then also updated the partition using GParted as described here, https://www.rootusers.com/use-gparted-to-increase-disk-size-of-a-linux-native-partition/
But still the disk size does not update, df -h shows
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/I0--vg-root 35G 33G 1.3M 100% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 2.4G 4.0K 2.4G 1% /dev
tmpfs 485M 564K 484M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 2.4G 4.0K 2.4G 1% /run/shm
none 100M 0 100M 0% /run/user
/dev/sda1 236M 44M 180M 20% /boot
/home/iadm/.Private 35G 33G 1.3M 100% /home/iadm