Allows you to attach a single EBS to multiple EC2 Instance within the same Availability Zone.  This feature is only available in the io1 and io2 family of volume types.  The characteristics include:

                1.  Attaches same EBS volume to multiple Instance in same Availability Zones.

                2.  Each Instance has full read write permissions.

                3.  Must use file system that is cluster-aware (XFS, EXT4, etc)

                4.  Supports up to 16 EC2 Instances at a time.

                5.  Only available in io1 and io2 storage classes.