How to perform DR test for the domain controller

Question

Hello,

We have two domain controllers at HQ site and another two domain controllers at DR site, we are planning to turn off HQ site (all servers) and switch to DR for testing.

How to perform a DR test and what's the needed considerations.

Thanks,

Answer 1

Hi,

I'm glad I can answer this question for you, and I hope it helps.

Performing a disaster recovery (DR) test involves simulating a scenario where the primary site (HQ) is unavailable, and the secondary site (DR) takes over the operations. Here are some considerations and steps to perform a DR test:

1.Test Plan: Develop a detailed plan outlining the objectives, scope, and specific scenarios to be tested during the DR exercise. Consider factors such as application availability, data replication, network connectivity, and user access.

2.Communication: Notify all relevant stakeholders, including IT teams, management, and users, about the scheduled DR test. Clearly communicate the purpose, duration, and expected impact of the test to manage expectations and minimize disruptions.

3.Test Environment Preparation:

Ensure that the DR site is adequately provisioned with infrastructure, including domain controllers, servers, storage, networking equipment, and power supply.

Set up appropriate network connectivity between the DR site and any required external systems or services.

Verify that the necessary backups and replicated data are available at the DR site.

4.Failover Testing:

Perform a controlled failover by shutting down all servers at the HQ site and activating the servers at the DR site.

Validate the functionality of critical services, applications, and resources at the DR site, including authentication, file services, database access, email, and other business-critical systems.

Test network connectivity and ensure proper routing between the DR site and other sites or remote locations.

Monitor system performance and conduct thorough testing to identify any issues or discrepancies.

5.Data Replication Validation:

Verify that data replication mechanisms, such as Active Directory synchronization, DFS-R, or any other relevant replication methods, are functioning correctly.

Check for data consistency and integrity between the primary and secondary sites.

Perform tests to ensure that data can be accessed and modified from the DR site.

6.User Access Testing:

Test user access to resources and applications from the DR site, including remote access, VPN connectivity, and any specific access requirements.

Verify that user authentication, permissions, and group policies are correctly applied at the DR site.

7.Documentation: Document the entire DR testing process, including observed issues, resolutions, and lessons learned. This documentation will be valuable for future reference and improvement of the DR strategy.

8.Post-Test Analysis: Conduct a post-test analysis to review the test results, identify areas for improvement, and update the DR plan accordingly. Address any shortcomings or gaps discovered during the test.

9.Regular Maintenance: Schedule periodic DR tests to ensure that the DR site remains functional and aligned with changes in the production environment. Regularly update and validate the DR plan to reflect any modifications or additions in infrastructure or critical systems.

Hope the information above is helpful. If you have any question or concern, please feel free to let us know.

Best Regards,

Daisy Zhou

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