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Metalogix Replicator 7.4 - Product and Concepts Guide

Web Front-ends

Web front ends process incoming requests on a web server. This section describes and depicts the various web front-end scenarios that are often used by companies and the way in which Replication can be set up to function with each.

Single Web Front-end

If your farm only has one web front-end server, then when the target Replicator instance requests a replication package, it makes the request from that web front-end server. IIS maps the path to the package file, then to the Replicator data folder on the disk, and then returns that file.
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Multiple Web Front-ends

When dealing with multiple web front-ends, Replicator only needs to be installed on one web front-end. In this case Replicator captures changes, extracts from the content database, and creates the package zipping it o the Replicator data folder on a shared network drive.

Scenario 1

If your web server has multiple web front-ends, a load balancer is often used in order to redirect traffic to a specific web front-end. Since replicator does not know which web front-end will be sending the package to the target, it is important that all web front-ends have IIS configured to map the Replicator data folder to a shared network folder.
 
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In the picture above, the load balancer is configured to receive incoming requests at http://wfe and forward them to any of the three available web front-ends. In the diagram, the request has been sent to WFE3, at http://wfe3. From this point the process works in the same way as the single web front-end example. IIS on WFE3 is configured to use the Replicator data folder for the export path and the package file is sent to the Target Replicator Instance that requested the package.

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