This remains true in Regions where fewer than three AZs are publicly available. All AZs in an AWS Region are interconnected with high-bandwidth, low-latency networking, over fully redundant, dedicated metro fiber providing high-throughput, low-latency networking between AZs.Īmazon S3 Standard, S3 Standard-Infrequent Access, S3 Intelligent-Tiering, S3 Glacier Instant Retrieval, S3 Glacier Flexible Retrieval, and S3 Glacier Deep Archive storage classes replicate data across a minimum of three AZs to protect against the loss of one entire AZ.
AZs give customers the ability to operate production applications and databases that are more highly available, fault tolerant, and scalable than would be possible from a single data center. Q: What is an AWS Availability Zone (AZ)?Īn Availability Zone (AZ) is one or more discrete data centers with redundant power, networking, and connectivity in an AWS Region. The strong consistency of S3 also reduces costs by removing the need for extra infrastructure to provide strong consistency. These applications automatically and immediately benefit from strong read-after-write consistency. High-performance computing workloads also benefit in that when an object is overwritten and then read many times simultaneously, strong read-after-write consistency provides assurance that the latest write is read across all reads. Strong read-after-write consistency helps when you need to immediately read an object after a write for example, when you often read and list immediately after writing objects. Q: Why does strong read-after-write consistency help me? S3 also provides strong consistency for list operations, so after a write, you can immediately perform a listing of the objects in a bucket with any changes reflected. Q: What is the consistency model for Amazon S3?Īmazon S3 delivers strong read-after-write consistency automatically, without changes to performance or availability, without sacrificing regional isolation for applications, and at no additional cost.Īfter a successful write of a new object or an overwrite of an existing object, any subsequent read request immediately receives the latest version of the object.
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