From reading the DFS documentation, AD appears required.

This is a problem for us because our servers are either stand alone (not in AD), or part of our hosting service AD, and AD is out of our hands.

The question is: How to do DFS, or something like DFS, when the servers are:

  1. In different DCs , and
  2. Not in any useful AD

Machines are Win2012-R2 and/or Server 2016

Looking to automagically mirror tlog backups and sql backups across machines, on a close-to-the-minute basis.

  • 2
    robocopy /mir ?
    – yagmoth555
    Sep 14, 2016 at 20:38
  • 1
    This sounds like a product recommendation question and will likely be closed as such. I've used a couple such utilities, a favorite of which is Syncthing (syncthing.net) Sep 14, 2016 at 21:17
  • 1
    @TimBrigham It is a Win OS question. It is: OS has feature X, which requires Y. So how do you achieve X if you can't hit the requirement? Other products are one way, but not necessarily the only way (ergo the question!) Sep 14, 2016 at 21:20
  • Use your google 'fu. For SQL specific use cases, look at the tools MS SQL includes for this kind of task technet.microsoft.com/en-us/library/ms151706(v=sql.105).aspx
    – Clayton
    Sep 14, 2016 at 22:44
  • @Craig620 Your link is to the wrong kind of solve... I am looking for a file based solve.... Sep 15, 2016 at 1:14

3 Answers 3


DFS is usable but a) cause issues working with open files b) Hyper-V, SQL Server and Exchange has no DFS support c) can't avoid a spit-bran issue. When multiple users works with the same file that has no sync between hosts will cause a two different original files.

For the case I asume the build of HA shared storage between servers will do the job. However, iSCSI storage vendors such as S2D, HPE VSA or StarWind Virtual SAN can provide required storage replication but all require the implementation of AD. Consider go with Active Directory to benefit with configuration of SMB/NFS on top of shared "nothing" storage.

  • 4
    No. DFS is not usable. Active Directory is a requirement to use DFS Replication. WIthout AD, DFS would just be the namespace without replication. Beyond that, replication between storage appliances almost never require Active Directory.
    – Rex
    Jan 25, 2017 at 20:59

DFS-R requires active directory, so that option will not be available to you. As yagmoth mentions in his comment, you could use robocopy

For example: robocopy /mir /mot:10 would run a mirror every 10 minutes. Could set it as a task on startup, etc..

Beyond that, there are 3rd party utilities that could also perform similar functionality - including backup dedicated utilities.


There are two options that I have used and work relatively well.

Peersync - http://www.peersoftware.com/products/sync-backup/peersync-for-servers.html

Is licensed however works really well, very well documented and easy to understand.

Freefilesync - http://www.freefilesync.org/

Is free only downsize there is no inherited automation, but once you configure your two directories to be synced, it has the option to create a batch file that can be run though a schedules task.

  • peersync looks good, but no idea what it costs or how to purch.... bummer! Jan 19, 2017 at 17:46
  • I believe its $49.99 for the standard per node, 1 way requires 1 license 2 way requires 2 licenses and so on. I not sure what the enterprise offers over the standard but I think its a 2 $20 difference. Jan 19, 2017 at 17:58
  • I do not see pricing or how to purch on their site.... where is that? Jan 19, 2017 at 18:13
  • peersoftware.com/contact.html - 703.763.7700 Jan 19, 2017 at 18:20
  • PeerLock is very expensive to deploy, and it isn't fastest solution TBH... Make sure you run some heavy POC before submitting your PO. Jan 25, 2017 at 11:21

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