I have an EBS volume (e.g. /dev/sdf) that has been attached to an EC2 instance (which boots from a different EBS volume), and I have mounted the volume (through
/dev/sdf
It would seem that the official ec2 documentation now recommends plain old fstab entries with nofail -
/dev/xvdf /data ext4 defaults,nofail 0 2
ref - http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-using-volumes.html