All 7 Amazon EFS (Elastic File System) questions
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What is Amazon EFS and how is it different from Amazon S3 or EBS? What are the different storage classes available in EFS? How does EFS ensure data durability and availability? How can you control access permissions for files and directories stored in EFS? How does EFS integrate with AWS Lambda and containerized workloads like ECS? What performance modes and throughput modes are available in EFS, and how do you choose between them?
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AWS › Amazon EFS (Elastic File System)

How do EFS mount targets work across multiple Availability Zones?

Intermediate

Answer

An EFS mount target is a network endpoint created within a specific subnet and Availability Zone that EC2 instances use to connect to the file system, and by creating a mount target in each Availability Zone of your VPC, you ensure that instances in any zone can access the same shared file system with low latency, even providing resilience if one Availability Zone experiences issues.
aws efs create-mount-target --file-system-id fs-12345678 --subnet-id subnet-0123abcd --security-groups sg-0123abcd
Real-world example A company running its application across three Availability Zones for high availability creates an EFS mount target in each zone, ensuring every instance can access shared files locally without added cross zone latency.

Common follow-ups: What happens if you try to mount EFS from a subnet without a mount target?;How do security groups control access to an EFS mount target?

VPC & Networking;AWS Backup & Disaster Recovery
All 7 Amazon EFS (Elastic File System) questions