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Amazon EFS is not available in all AWS regions<ref>https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/</ref>, in Asia Pacific (Seoul) became available in May 2018<ref>https://aws.amazon.com/about-aws/whats-new/2018/05/amazon-elastic-file-system-amazon-efs-available-in-asia-pacific-seoul-region/</ref>.
Amazon EFS is not available in all AWS regions<ref>{{Cite web|url=https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/|title=AWS Regional Table|website=Amazon Web Services, Inc.}}</ref>, in Asia Pacific (Seoul) became available in May 2018<ref>{{Cite web|url=https://aws.amazon.com/about-aws/whats-new/2018/05/amazon-elastic-file-system-amazon-efs-available-in-asia-pacific-seoul-region/|title=Amazon Elastic File System (Amazon EFS) Available in Asia Pacific (Seoul) Region|website=Amazon Web Services, Inc.}}</ref>.
Amazon Elastic File System (Amazon EFS) is a cloud storage service provided by Amazon Web Services (AWS) designed to provide scalable, elastic, concurrent with some restrictions, and encrypted file storage for use with both AWS cloud services and on-premises resources. Amazon EFS is built to be able to grow and shrink automatically as files are added and removed. Amazon EFS supports Network File System (NFS) versions 4.0 and 4.1 (NFSv4) protocol, and control access to files through Portable Operating System Interface (POSIX) permissions.