Does DFS Replication overcome common File Replication Service issues?ĭFS Replication replicates NTFS file permissions and alternate data streams. Choose the member that has the most up-to-date files that you want to replicate because the primary member's content is considered "authoritative." This means that during initial replication, the primary member's files will always overwrite other versions of the files on other members of the replication group.įor information about pre-seeding and cloning the DFSR database, see DFS Replication Initial Sync in Windows Server 2012 R2: Attack of the Clones.įor more information about the initial replication, see Create a Replication Group. To prestage a replication group member, copy the files to the appropriate folder on the destination server(s), create the replication group, and then choose a primary member. If two files differ by other attributes, such as compression, then the contents of the file are replicated. For more information, see SetFileAttributes Function in the MSDN library ( ). A real attribute is an attribute that can be set by the Win32 function SetFileAttributes. The initial replication does not need to replicate contents when files differ only by real attributes or time stamps. This "prestaging" can dramatically reduce the amount of data replicated during the initial replication. DFS Replication supports copying files to a replication group member before the initial replication. The following file attribute values also trigger replication, although they cannot be set by using the SetFileAttributes function (use the GetFileAttributes function to view the attribute values). The following attribute values are replicated by DFS Replication, but they do not trigger replication. The contents of the file are not replicated unless the contents change as well. Changes to these attribute values trigger replication of the attributes. The following attribute values are set by using the SetFileAttributes dwFileAttributes function, and they are replicated by DFS Replication. No, you cannot configure which file attributes that DFS Replication replicates.įor a list of attribute values and their descriptions, see File Attributes on MSDN ( ). Performance Does DFS Replication support dial-up connections? Scripts can use WMI to collect backlog information-manually or through MOM. On computers running Windows Server 2012 R2, Windows Server 2012 or Windows Server 2008 R2, Dfsrdiag.exe can also display the updates that DFS Replication is currently replicating. The backlog count is the number of updates that a replication group member has not processed. Backlog shows you how many files still need to replicate before two computers are in sync. Propagation shows you if files are being replicated to all nodes. For more information, see Distributed File System Replication Cmdlets in Windows PowerShell.ĭfsrdiag.exe is a command-line tool that can generate a backlog count or trigger a propagation test. The DFSR Windows PowerShell module in Windows Server 2012 R2 contains cmdlets for starting propagation tests and writing propagation and health reports. There are a number of ways to monitor replication:ĭFS Replication has a management pack for System Center Operations Manager that provides proactive monitoring.ĭFS Management has an in-box diagnostic report for the replication backlog, replication efficiency, and the number of files and folders in a given replication group. This can cause DFS Replication to continually retry replicating the files, causing holes in the version vector and possible performance problems. For example, if a user copies a 10 megabyte (MB) file onto server A (which is then at the hard limit) and another user copies a 5 MB file onto server B, when the next replication occurs, both servers will exceed the quota by 5 megabytes. It's possible for individual members of a replication group to stay within a quota before replication, but exceed it when files are replicated. No folders may exceed the quota before the quota is enabled. Screened files must not exist in any replicated folder before screening is enabled. The hidden DfsrPrivate folder must not be subject to quotas or file screens. The following are best practices for implementing file screens or quotas: In addition, DFS Replication has its own filter mechanism for files and folders that you can use to exclude certain files and file types from replication. However, the File Server Resource Manager (FSRM) file screening settings must match on both ends of the replication.
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