From SERVER1 :
cd /
sudo umount /dev/xvdf
sudo nano /etc/fstab AND delete line: /dev/xvdf /date ext4 defaults 0 0
go to AWS and STOP SERVER1
go to AWS Volume and Detach volume
go to AWS Volume and Attach Volume to SERVER2
From SERVER2 :
cd /
sudo mkdir /drive-4
sudo mount /dev/xvdf /drive-4
Auto mount disk after reboot sudo nano /etc/fstab
Add this line /dev/xvdf /drive-4 ext4 defaults 0 0
ls -l cd /drive-4
If you need to attache volume from different zone like eu-west-1a you need to create snap-shout to the volume and create a volume in your ec2 zone.