Question: Create a volume group with name myvgex, and set 16M as a extends. And divided a volume group containing 50 extends on volume group lvext, 
	  make it as ext4 file system, and mounted automatically under /mnt/lvext.

Solution:

fdisk /dev/sda
	- Create two Linux LVM as /dev/sda1 /dev/sda2

pvcreate /dev/sda1 /dev/sda2

vgcreate myvgex --physicalextentsize 16M /dev/sda1 /dev/sda2

lvcreate -n lvext --extents 50 myvgex

	- In case of error in size, extend volume group as:
	- fdisk /dev/sda to create Linux LVM as /dev/sda3
	- pvcreate /dev/sda3
	- vgextend myvgex /dev/sda3

# now it should have suff. space

lvcreate -n lvext --extents 50 myvgex

mkfs.ext4 /dev/mapper/myvgex-lvext -L VGEXT

blkid /dev/mapper/myvgex-lvext

mkdir -p /mnt/lvext

vim /etc/fstab
	- LABEL="VGEXT"   /mnt/lvext      ext4    defaults        0 0

mount -a

systemctl daemon-reload

# To Verify
reboot 
