Multi-Attach is now available on Amazon EBS Provisioned IOPS volume type, io2. Launched in August 2020, io2 is the newest generation of our Provisioned IOPS volume type designed for 99.999% durability (100x io1) and 500:1 IOPS:GiB (10x io1). Multi-Attach lets you share access to an EBS data volume between up to 16 Nitro-based EC2 instances within the same Availability Zone (AZ). Each attached instance has full read and write permission to the shared volume. Multi-Attach is intended to make it easier to achieve higher application availability for customers that want to deploy applications that manage storage consistency from multiple writers in shared storage infrastructure.
Source:: Amazon AWS