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What are the advantages and disadvantages of parallel deployment testing?

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Parallel deployment testing is a strategy for implementing a new system or software while keeping the old one running simultaneously. It is often used to reduce the risk of failures, errors, or user dissatisfaction that might occur during a transition. In this article, you will learn about the advantages and disadvantages of parallel deployment testing and how to decide if it is suitable for your project.

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Jeff Mason, BBA, AWS CCP, 6S Green Belt

PayIt LLC (payitgov.com)

1 Advantages of parallel deployment testing

One of the main benefits of parallel deployment testing is that it allows you to compare the performance, functionality, and accuracy of the new and old systems or software. You can identify and fix any bugs, glitches, or gaps in the new system before fully replacing the old one. You can also monitor the user feedback and acceptance of the new system and provide training and support as needed. Additionally, parallel deployment testing minimizes the downtime and disruption of your operations, as you can switch back to the old system in case of any major issues or emergencies.

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Jeff Mason, BBA, AWS CCP, 6S Green Belt

PayIt LLC (payitgov.com)
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I also agree that the real-time comparability of the new and old systems is a major benefit of parallel deployment strategies. As well, the ability for near-immediate fall-back to the old system acts as an added safety net, in the event the new system does not fully meet expectations.

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2 Disadvantages of parallel deployment testing

However, parallel deployment testing also has some drawbacks that you should consider before choosing this strategy. First of all, it can be costly and time-consuming to maintain and run two systems or software at the same time. You will need more resources, equipment, and staff to manage the data synchronization, duplication, and validation between the two systems. You will also need to ensure that the security and compliance of both systems are up to date and consistent. Secondly, parallel deployment testing can cause confusion and frustration among the users, as they have to learn and use two different systems or software. You will need to communicate clearly and frequently with the users about the purpose, duration, and expectations of the parallel deployment testing.

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Jeff Mason, BBA, AWS CCP, 6S Green Belt

PayIt LLC (payitgov.com)
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Agreed: more effort, resources and time are involved with parallel deployment. Multiple code pipelines must be maintained. It takes more DevOps management and project management time and resources.

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3 Factors to consider for parallel deployment testing

Parallel deployment testing is not a one-size-fits-all solution for every project and you must weigh the pros and cons based on your specific goals, requirements, and constraints. When considering parallel deployment testing, you should think about the complexity and scope of the new system or software, the risk and impact of failure or error, and the availability and affordability of resources. If the new system or software is significantly different from the old one, parallel deployment testing can help verify its functionality and compatibility. Additionally, if the failure or error of the new system or software could have serious consequences for your business, customers, or stakeholders, parallel deployment testing can provide a backup plan. On the other hand, if the new system or software is relatively simple or similar to the old one, or if you have limited resources, parallel deployment testing may not be necessary or feasible.

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4 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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What are the advantages and disadvantages of parallel deployment testing?

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1 Advantages of parallel deployment testing

2 Disadvantages of parallel deployment testing

3 Factors to consider for parallel deployment testing

4 Here’s what else to consider

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