Amazon EBS Multi-Attach enables you to attach a single Provisioned IOPS SSD (io1 or io2) volume to multiple instances that are in the *same Availability Zone. *
You can attach multiple Multi-Attach enabled volumes to an instance or set of instances.
Each instance to which the volume is attached has full read and write permission to the shared volume.
Multi-Attach makes it easier for you to achieve higher application availability in applications that manage concurrent write operations.
It can be attached to up to 16 instances built on the Nitro System that are in the same Availability Zone.
You should use a clustered file system to ensure data resiliency and reliability for your production workloads. Standard file systems, such as XFS **and **EXT4, are **NOT **designed to be accessed simultaneously by multiple servers, such as EC2 instances.
You can't enable or disable Multi-Attach while the volume is attached to an instance.
Related docs : https://docs.aws.amazon.com/ebs/latest/userguide/ebs-volumes-multi.html
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