Steps for EBS Volume Mounting & Unmounting

Create volume from AWS console
Attache volume to AWS Instance
Login to Instance and execute following commands
sudo mkfs -t ext2 /dev/sdf

mkdir /var/lib/app_vol/
sudo mount -t ext2 /dev/sdf /var/lib/app_vol/
unmount /var/lib/app_vol/
Detach volume from AWS console...