How DFSR file conflict algorithm works | DFSR replicated file missing

How DFSR file conflict algorithm works:

Conflict resolution in DFSR (Distributed File System Replication) is crucial for maintaining data consistency across multiple servers. Here’s a more detailed look at how DFSR handles conflicts:

1. Initial Sync Conflict Algorithm

Scenario: When setting up a new replication group, if different versions of the same file exist on each server.

Resolution: The file from the primary server wins all conflicts. For example, if Server A is set as the primary server, its version of the file will be replicated to all other servers1.

2. Last Writer Wins Conflict Algorithm

Scenario: When existing files that have been replicated previously are modified on multiple servers before replication.

Resolution: The file with the latest UTC timestamp wins. For instance, if Server A modifies a file last, its version will be replicated to Server B1.

3. New Files Conflict Algorithm

Scenario: When new files are created on multiple servers before replication, but initial sync is not happening.

Resolution: The behavior depends on the Windows Server version and updates. In some cases, the older file is replicated, while in others, the newer file is replicated1.

Conflict and Deleted Folder

When conflicts occur, DFSR moves the losing file to a special folder called DfsrPrivate\ConflictAndDeleted. This ensures that no data is lost and administrators can review and restore files if necessary2.

Ongoing Replication Conflicts

During ongoing replication, DFSR uses a set of conflict-handling algorithms to ensure that the appropriate files replicate between servers. This includes detecting file collisions and appropriately handling a winning and losing file3.