Sites and Replication in .NET

Creating Code 128 Code Set A in .NET Sites and Replication

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Sites and Replication
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object; use the Description field to indicate the purpose of any manually created connection object. Within a site, there are very few scenarios that would require creating a connection object. One such scenario is standby operations masters. Operations masters are discussed in 10. It is recommended that you select domain controllers as standby operations masters to be used in the event that the operations master role must be transferred or seized. A standby operations master should be a direct replication partner with the current operations master. Thus, if a domain controller named DC01 is the RID master, and DC02 is the system that will take the RID master role if DC01 is taken offline, then a connection object should be created in DC02 so that it replicates directly from DC01.
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Intrasite Replication
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After connection objects between the domain controllers in a site have been established automatically by the KCC or manually replication can take place. Intrasite replication involves the replication of changes within a single site.
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Consider the site shown in Figure 11-10. When SERVER01 makes a change to a partition, it queues the change for replication to its partners. SERVER01 waits 15 seconds, by default, to notify its first replication partner, SERVER02, of the change. Notification is the process by which an upstream partner informs its downstream partners that a change is available. SERVER01 waits three seconds, by default, between notifications to additional partners. These delays, called the initial notification delay and the subsequent notification delay, are designed to stagger network traffic caused by intrasite replication. Upon receiving the notification, the downstream partner, SERVER02, requests the changes from SERVER01, and the directory replication agent (DRA) performs the transfer of the attribute from SERVER01 to SERVER02. In this example, SERVER01 made the initial change to Active Directory. It is the originating domain controller, and the change it made originates the change. When SERVER02 receives the change from SERVER01, it makes the change to its directory. The change is not called a replicated change, but it is a change nonetheless. SERVER02 queues the change for replication to its own downstream partners. SERVER03 is a downstream replication partner of SERVER02. After 15 seconds, SERVER02 notifies SERVER03 that it has a change. SERVER03 makes the replicated change to its directory and then notifies its downstream partners. The change has made two hops, from SERVER01 to SERVER02 and from SERVER02 to SERVER03. The replication topology will ensure that there are no more than three hops before all domain controllers in the site have received the change. At approximately 15 seconds per hop, that means the change will have fully replicated in the site within one minute.
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Lesson 3: Configuring Replication
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It is possible that SERVER01 might not make any changes to its replicas for quite a long time, particularly during off hours. In this case, SERVER02, its downstream replication partner, will not receive notifications from SERVER01. It is also possible that SERVER01 might be offline, which would also prevent it from sending notifications to SERVER02, so it s important for SERVER02 to know that its upstream partner is online and simply does not have any changes. This is achieved through a process called polling. Polling involves the downstream replication partner contacting the upstream replication partner with a query as to whether any changes are queued for replication. By default, the polling interval for intrasite replication is once per hour. It is possible, although not recommended, to configure the polling frequency from the properties of a connection object by clicking Change Schedule. If an upstream partner fails to respond to repeated polling queries, the downstream partner launches the KCC to check the replication topology. If the upstream server is indeed offline, the site s replication topology is rebuilt to accommodate the change.
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