S3 Replication

5 minutes 5 Questions

S3 Replication allows automatic, asynchronous copying of objects across buckets. This can provide redundancy, improve access latency for geographically distributed applications, and meet compliance requirements. Amazon S3 supports several types of replication, including Same-Region Replication, Cro…

Guide to Amazon S3 Replication

What is Amazon S3 Replication?
Amazon S3 Replication is a feature in AWS that automatically replicates (copies) objects across multiple S3 buckets for data redundancy or quicker access to data in diverse geographical regions. It increases business efficiency by ensuring data availability and durability.

Why is it important?
The importance of S3 Replication lies in its capacity to:
1. Safeguard against accidental deletions, or failures.
2. Comply with regulatory standards by maintaining copies of data in different locations.
3. Enhance performance by serving data closer to the users' location.

How does it work?
S3 Replication works by setting up rules in the S3 management console or through AWS SDKs to specify the source and destination buckets. AWS then takes care of replicating newly uploaded objects automatically.

Exam Tips: Answering Questions on S3 Replication
For successful answers in an S3 Replication exam, remember the key points:
1. S3 Replication is asynchronous and only replicates new objects by default.
2. Its cost includes data transfer and storage cost of the replicated data.
3. S3 Replication does not replicate existing objects unless the replication configuration is changed to replicate existing objects.
4. Versioning must be enabled on both the source and destination buckets for replication to happen.

How to set up S3 Replication:
1. Enable versioning on both source and destination buckets.
2. Create a replication rule on the source bucket, specifying the destination bucket and IAM role to grant Amazon S3 the permissions.
3. Optionally, you can select filters to replicate specific objects.
4. Amazon S3 now automatically replicates new objects to the destination bucket.

Remember, practice is vital for mastering the concept. Use AWS free tier to gain hands-on experience.

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Question 1

A company wants to enable S3 replication, but they are concerned about the possible impact on the performance of their existing applications. How does S3 replication impact their existing applications?

Replication increases application latency Decreases the throughput of their applications Replication reduces the available bandwidth No impact on the performance of existing applications

Correct Answer: No impact on the performance of existing applications

S3 replication has no impact on the performance of existing applications. It operates asynchronously and transfers data from the source bucket to the destination bucket in the background. There is no immediate effect on application performance.

Question 2

A company wants to replicate data between two Amazon S3 buckets with a requirement to maintain the replica in a different AWS region. What type of replication should be used?

Cross-Region replication Same-Region replication Cross-Account replication Cross-Partition replication

Correct Answer: Cross-Region replication

Cross-Region replication should be used to maintain a replica of the data in another AWS region. Cross-Account replication is used to maintain replicas across different AWS accounts, and Same-Region replication is used when data is replicated within the same region.

Question 3

A company has two AWS accounts, Account A and Account B, with S3 buckets in each account. They want to enable cross-account replication. How can the company accomplish this?

Enable Cross-Origin Resource Sharing (CORS) in both S3 buckets. Create an IAM role for replication in Account A with permission to replicate objects and grant Account B permission to assume the role. Duplicate the objects in the second bucket manually. Create a VPC peering connection between the two accounts.

Correct Answer: Create an IAM role for replication in Account A with permission to replicate objects and grant Account B permission to assume the role.

Cross-account replication can be accomplished by creating an IAM role for replication in Account A with required permissions to replicate objects in Account B. The IAM Role ARN should also be added as the destination in the S3 bucket replication configuration. Enabling CORS, VPC peering, duplicating objects manually, using S3 Replication Gateway, and AWS Glue ETL Jobs are not relevant for this use case.

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