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Testing and Mitigating Issues CHapTER 5 169
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Resolve any application compatibility issues . Identify and create application compatibility solutions by using the ACT tools, which include the IECTT, either the stand-alone version or the virtual version of the SAT, the SUA, and the Compatibility Administrator . Deploy or distribute your test and certified applications and solutions . Use a deployment and distribution tool, such as System Center Configuration Manager 2007, to deploy your certified applications and compatibility issue solution packages to your client desktops .
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When testing an application in a new operating system, Microsoft recommends that you retain the default security feature selections . Microsoft also recommends that you thoroughly test the applications, replicating as many of the usage scenarios from within your organization as possible . Finally, Microsoft recommends that you enter your issues and solutions into the ACM so that you can track the data from a central location . When testing a Web site or a Web application, Microsoft recommends that you include both intranet and extranet sites, prioritizing the list based on how critical the site or the application is to your organization . Microsoft also recommends that you thoroughly test the Web sites and Web applications, replicating as many of the usage scenarios from within your organization as possible . Finally, Microsoft recommends that you enter your issues into the ACM so that you can share that data with both Microsoft and the ACT Community to receive potential solutions for your issues .
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Your test environment should be a long-term investment in the overall deployment process . Retain the test environment after the deployment to assist in future deployment projects . To create the test environment, you must determine how to model the production environment in the test environment and configure the test environment to support automated testing of the mitigation strategies . Microsoft recommends that you establish a dedicated and isolated lab environment for use in developing and testing the application compatibility mitigation . The lab should mirror your production environment as closely as possible . In some cases, you might find that it is better to open up the test network to existing production services, instead of replicating your production environment in detail . For example, you might want to permit your Dynamic Host Configuration Protocol (DHCP) packets to pass through routers into the test network . Some operations can be safely conducted in the production environment, such as the application inventory collection process . At a minimum, your lab environment should include:
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DHCP services Domain Name System (DNS) services SQL Server 2005 or SQL Server 2005 Express Lab test user accounts, with both normal user and administrative privileges Network hardware to provide Internet access (for downloading updates, files, and so on)
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Test computers that accurately reflect production computers in both software and hardware configuration A software library representing all the applications to be tested Windows Server 2008 R2 with Hyper-V Windows Internet Naming Service (WINS) services (optional)
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In most instances, you must test the mitigation strategies more than once and must be able to revert reliably to a previous test state . Automating your testing process enables you to ensure reproducibility and consistency in your testing process . Using test automation tools enables you to run your test cases in a standardized, reproducible manner . Using disk-imaging software for physical images of the servers and using software virtualization features for reversing changes to virtualized hard disks enables you to restore your test environment back to a previous state .
Modeling the production Environment
The goal of the test environment is to model your production environment . The more accurate the production environment, the greater the validity of the testing performed in that test environment . Microsoft recommends the following best practices in creating your test environment:
Use virtual or physical images of production computers to create their test environment counterparts . Virtual or physical images can help ensure that the test environment configuration accurately reflects the production environment . In addition, the images contain live information (such as users, user profiles, and file permissions) to use in testing . Separate your test environment physically from your production environment . A physically separate test environment enables you to use an identical IP configuration and helps ensure that tests conducted in the test environment do not affect the production environment . Using the identical IP address, subnets, and other network configuration information helps to ensure the fidelity of the test environment . However, duplicating IP addresses might not always be the best option when applications do not rely on a hard-coded IP address . You might also pass some network traffic through the router from the production environment to reduce the need for replicating network services . For example, opening the ports for DHCP to pass through eliminates the need for a separate DHCP server in the test lab . Ensure that your test environment is at the same service pack and update level as your production environment . Before performing application mitigation testing, update your lab environment by applying service packs and updates or by refreshing the virtual or physical images of your production counterparts . Consider adding the test environment to the change-management process to simplify tracking the updates . Ensure that you perform all your application mitigation tests by using accounts that have similar permissions as the accounts in your production environment . For example,
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