EBS Multi-Attach allows a single io1 or io2 volume to be mounted on multiple EC2 instances in the same Availability Zone. All attached instances have full read and write access to the volume.
Use cases:
- Increase application availability for clustered Linux deployments (e.g., Teradata).
- Enable shared storage where the application is designed to handle concurrent writes.
Key characteristics:
- Supports up to 16 EC2 instances per volume.
- Requires a cluster-aware file system (not standard XFS or EXT4).
- Only available for Provisioned IOPS SSD volumes (io1 and io2).