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CHAPTER 17 ARCHITECTURE
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Note In a 3-tier configuration, the AOS management service connects a client to a server and does load
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balancing. However, once the AOS management service has assigned a server to a client, the client works with that server for the remainder of its session (i.e., until it logs off). This means that load balancing distributes users evenly among the nodes in an AOS cluster; it does not ensure a balanced load on the nodes that participate in a cluster.
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Figure 17-4 illustrates this at a glance.
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Figure 17-4. Multiple-AOS setup
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CHAPTER 17 ARCHITECTURE
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Note An AOS cluster appears to clients as one single logical system, so if one goes down, the server
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manager stops assigning it to client requests. However, because a client is actually assigned to a specific AOS for the length of its session, if the AOS crashes the session is lost.
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Multiple-Application Setups
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When you create an Axapta configuration using the client or AOS configuration utilities, you specify which application and database to use for the configuration. Here are some typical applications for this feature: As a developer, you develop and maintain several different customized applications, one for customer A and another for customer B. By creating a configuration that uses the same client and AOS but different applications and databases, you can start up both applications on your workstation or on a development server when you need them, and you don t need separate physical environments. You can run the two applications simultaneously, each in its own memory space. The code base and data will be different even though the Axapta client and AOS are on the same physical hardware. As an administrator, you can centralize and consolidate your infrastructure by setting up different databases on the same database server for development, test, and production systems, and then make a configuration that points to the application where development takes place, another for the application where you test, and one for your production application. When developers are finished with a feature they copy it to the test application, and when testers are happy they copy it to the production application. Everyone can share the same AOS server machine application disk server, and database server while actually working on different versions of the application without interfering with each other. In a geographically distributed organization, different branch offices can have local copies of the client application and AOS but share a database. In this way, you minimize traffic to data flowing back and forth between the branches and your central database. However, any changes to your production application must be applied to all the branches where there is a local copy. You also can have local databases that replicate to a central database, enabling the branches to operate even if there is no access to the central system where all data is consolidated. Figure 17-5 illustrates this.
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CHAPTER 17 ARCHITECTURE
Figure 17-5. Multiple-application setup
That s it in a nutshell; in the next section you ll see the components physical makeup.
Folders and Files
When you installed Axapta, three folder structures were created, and if you followed our naming recommendations you have them on the selected disk as Axapta_Application, Axapta_Client, and Axapta_Server.
Note You must always install the client and application components and the corresponding files. The
server component is installed only if you decide to have a 3-tier configuration, and consequently the AOS files will be there or not depending on your decision.
Each of the components we have looked at in the previous section is made up of a series of files that are grouped together in corresponding folder structures. Knowing these is particularly important for development and backup purposes.
CHAPTER 17 ARCHITECTURE
As a developer, knowing where the different objects in Axapta are gives you an understanding of how the system physically functions and what goes on as you customize it and add your own code and metadata. As a system administrator, you need to know what to back up and restore, and when to do so. The following sections provide a detailed description of the folder structures and files that make up the Axapta system by component.
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