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Complex AWS Migrations (Technical Blog Series)

July 7, 2022 - Paul Corley

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Welcome to our third and final blog around migrations to AWS. We have looked at ‘Why Migrate to AWS?’ and also ‘How to Migrate?’ this third blog looks at complex AWS migrations.


Database Migration Service (DMS)

When transferring your Database to AWS, there are ways to ensure that the migration is performed securely and efficiently. You can use native tools such as PostgreSQL or MySQL, however, there is an easy way to migrate databases from any source to any target.

Database Migration Service (DMS) is an AWS fully managed service that makes it easy to migrate your data to and from various sources, including Oracle and Microsoft SQL Server. The migration process is fully automated and uses the AWS CLI or the AWS Management Console to initiate the transfer.

DMS does have some setbacks as this service does not always work with complex databases. For example, if you have a large database, the system can take a long time to process all the data. In addition, if your source database is on-premises, there will be additional latency due to the need for data to be transferred over the internet.


Moving Complex Data

AWS has many services that can help you migrate your data to the Cloud. CloudHSM and Snowball are two examples.

However, sometimes, AWS services cannot quite migrate all the data you need. Especially if you have many small files or if they are hosted on a Network Attached Storage (NAS). In this case, it needs to be synced, which means it must be matched up with an existing data set and modified as required. That’s a lot of work, especially if it is a large dataset that needs to be moved regularly or if your original data set changes regularly.

AWS DataSync can help resolve this problem by enabling you to easily sync your on-premises data with Amazon S3 buckets in the Cloud. This makes it relatively easy to quickly move your data and provides a simple solution for keeping your on-premises and cloud data consistent.

If you cannot use AWS DataSync, you can use Rsync, an open-source data transfer tool. This will also help you to transfer data from one AWS region to another.

Rsync is an open-source data transfer tool that copies files and directories from one location to another while minimizing internet traffic. It’s designed to be fast, efficient, and secure. You can use it locally or over a network connection between two systems.

Whether CloudEndure, DataSync, Storage Gateway, or Rsync, the right strategy for moving your data will depend on how much data you have, where it’s located, and what it’s used for. Each tool has its strengths and weaknesses. It is essential to choose the right migration tool for your use case and understand how it works to get the best results.

You might consider using the AWS Snow Family if you have a lot of data. This family of services will help you move your data from one place to another.

The Snowball is Amazon’s primary offering for moving large amounts of data. It comes in four sizes: 8 TB, 42 TB, 80 TB, and 100 PB. You can connect AWS Snowcone, AWS Snowball Edge Storage Optimized, and AWS Snowball Edge Compute Optimized to your computer via USB or an AWS storage device directly and then ship it to Amazon. Your data will be loaded onto one of their storage services (S3 or Glacier). The whole process takes about 5 minutes.

If you want to move terabytes of data around but don’t want to spend the money on shipping a physical device back and forth, there’s also the Snowmobile which can hold up to 100 PB of data!


Migrating – What to Do and When

If you want to move your data centre to AWS, there are a few things that will help the migration process run smoothly:

  • Plan ahead and estimate the time and how much it will cost.
  • Write a plan for migrating servers, databases, applications, and other infrastructure.
  • Create an inventory of all your systems to know what needs to be migrated.
  • Create scripts for moving data between on-premises environments and AWS regions.
  • Develop strategies for testing new applications in the Cloud.


After migration

Congratulations on completing the migration process if you made it this far!

You should now have a functional cloud environment in AWS that you can use as your testing playground. You will also be able to replicate production systems and data into AWS and test your applications against this replicated data.

You should also consider optimizing your cloud architecture by using serverless applications and splitting monolithic elements to eliminate points of failure.



Migrating to AWS is a lot like preparing for a new website to go live. You have to ensure everything is in order and that your site runs as smoothly as possible to avoid any unexpected downtime or latency issues. However, migrating a whole infrastructure to the cloud is an even bigger undertaking, so working with a partner to guide you during the transition is advisable.

We hope you’ve found this series on Migrating to AWS to be a valuable guide and are excited about the many benefits of migrating to AWS. Whatever your requirements are, there is an AWS migration solution to fit, from single applications and operating systems to more complex migrations and hybrid/multi-cloud environments. However, if you require assistance, please reach out to our experienced cloud team; as an accredited AWS partner, we will help you with every stage of your migration journey. Cloud@transactts.com

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