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Follow this procedure to create a replication group.
|To create a replication group|
Click Start, point to Administrative Tools, and then click DFS Management.
In the console tree, right-click the Replication node, and then click New Replication Group.
Follow the instructions in the New Replication Group Wizard.
Before making a member of a replication group read-only, review the Performance Considerations section of Make a Replicated Folder Read-Only on a Particular Member.
To include a failover cluster in a replication group, see Add a Failover Cluster to a Replication Group.
What happens during the initial replication
When you first set up replication, you must choose a primary member. Choose the member that has the most up-to-date files that you want to replicate to all other members of the replication group, because the primary member's content is considered "authoritative" during initial replication. This means that during initial replication, the primary member's files will always win the conflict resolution that occurs when the receiving members have files that are older or newer than the associated files on the primary member.
The following concepts will help you better understand the initial replication process:
- Initial replication does not begin
immediately. Configuration changes are not applied immediately to
all members. The new configuration must be replicated to all domain
controllers, and each member in the replication group must poll its
closest domain controller to obtain the changes. The amount of time
this takes depends on AD DS replication latency and the long
polling interval (60 minutes) on each member. To poll immediately
for configuration changes, open a command prompt window and then
type the following command once for each member of the replication
dfsrdiag.exe PollAD /Member:DOMAIN\Server1.
- Initial replication always occurs between the
primary member and the receiving replication partners of the
primary member. After a member has received all files from the
primary member and completed building its database, initial
replication is complete. The member will then replicate out any
local files not already on the primary member. In this way,
replication for a new replicated folder starts from the primary
member and then progresses to the other members of the replication
- When receiving files from the primary member
during initial replication, if a receiving member contains files
that are not present on the primary member, those files are moved
to their respective DfsrPrivate\PreExisting folder. If a file is
identical to a file on the primary member, the file is not
replicated. If the version of a file on the receiving member is
different from the primary member’s version, the receiving member's
version is moved to the Conflict and Deleted folder and remote
differential compression (RDC) can be used to download only the
changed blocks. To avoid conflicts, do not make changes to files in
the replicated folder on non-primary members until initial
- To determine whether files are identical on
the primary member and receiving member, DFS Replication compares
the files by using a hash algorithm. If the files are identical,
only minimal metadata is transferred.
- After the initialization of the replicated
folder, when all existing files in the replicated folder are added
to the DFS Replication database, the primary member designation is
removed. That member is then treated like any other member and its
files are no longer considered authoritative over other members
that have completed initial replication. Any member that has
completed initial replication is considered authoritative over
members that have not completed initial replication.