AWS EBS mount new volume to the EBS EC2 Instance at Linux level

login to the Linux system using post
then enter below command as sudo user
sudo su -

You can see the new 1gb volume : lsblk

check the file system format if its empty or we have files : files -s /dev/xvdf

format the filesystem using ext4 : mkfs -t ext4 /dev/xvdf
 
Create alias disk name to be mounted :
mkdir /newdisk
ls -ld /newdisk

Mount the new volume to /newdisk using below command
mount /dev/xvdf /newdisk
df -h


Now make permanent in fstab,So that even after reboot we will have to /newdisk with new volume details.
Backcup the /etc/fstab before doing change
cp /etc/fstab /etc/fstab.orig

either edit the file /etc/fstab or append like below
echo "/dev/xvdf       /newdisk   ext4    defaults,nofail        0       0" >> /etc/fstab
then check the file
cat /etc/fstab

Test the Disk:cd /newdisk; touch a; ls -ltr