{"id":9017,"date":"2019-11-08T02:57:38","date_gmt":"2019-11-08T09:57:38","guid":{"rendered":"https:\/\/www.resilio.com\/blog\/?p=9017"},"modified":"2025-03-03T09:19:33","modified_gmt":"2025-03-03T16:19:33","slug":"dfsr-alternative","status":"publish","type":"post","link":"https:\/\/blog.resilio.com\/blog\/dfsr-alternative","title":{"rendered":"A DFSR Alternative: Fast & Resilient P2P File Replication with Connect"},"content":{"rendered":"\n

What is DFSR?<\/h2>\n\n\n\n

DFSR (sometimes written DFS-R), or distributed file system replication, is a feature of Windows Server for replicating files across several servers. Microsoft introduced this feature in Windows NT4.0 as an add-on, and it became a standard feature in Windows 2000 server and on.<\/p>\n\n\n\n

Basically, it was an attempt by Microsoft to solve the complex problem of distributing files in real time so teams across several offices could collaborate effectively. Nowadays, the challenge of real time file replication and distribution is much easier to solve, with the advent of the public cloud. Instead of sharing files between offices, people work directly with the cloud. However, the cloud doesn’t solve all the issues in collaboration and you might still need to build a system where several servers need to be synchronized across different offices. Let\u2019s see if DFSR from the early 2000\u2019s is an adequate response to these needs, or if a DFSR replacement should be considered.<\/p>\n\n\n\n

When to use a Distributed File Systems Replication Tool vs. When to Find an Alternative<\/h2>\n\n\n\n

First, let’s see why you might need to synchronize servers directly. One of the reasons might be that you have big files and would require significant time to upload to the cloud. The second case might be that due to a variety of reasons you can’t upload files to the cloud. It might be security concerns, company or government policy etc. Third and most popular reasons that we see is that moving files or synchronizing servers is just a part of your workflow. You are building a business process that is more complex than just uploading and downloading files to the cloud.<\/p>\n\n\n\n

DFSR is a standard client-server or 1:1 file synchronization approach that was popular 10-15 years ago. Most other commercial solutions use the same model for synchronization \u2013 copy a file from point A to point B. This approach obviously has limitations, such as the availability of A \u2013 if server A is not available, then server B and C will not get the data. If there is a resource shortage on server A (networking, memory, CPU) the load cannot be moved to server B, even if it has all the data available.<\/p>\n\n\n\n

DFSR Issues & Size Limits<\/h2>\n\n\n\n

There are a number of other limitations to DFSR. If you need to extend your file synchronization beyond Windows servers, DFSR is not the right tool for the job. You also can\u2019t give different roles to different servers, e.g. if you need some servers to just read information, without being able to change it.<\/p>\n\n\n\n

A DFSR-based solution may be effective for some businesses, but let\u2019s take a look into typical DFSR problems that can arise.<\/p>\n\n\n\n

DFSR Over Long WAN Connections<\/h3>\n\n\n\n

When you need to send data to remote locations over mobile or satellite connections that have a very long retransmission time and potential for packet losses, DFSR can run into problems.  It\u2019s based on the TCP\/IP protocol, which treats every packet loss as a network congestion and backs off speed in order to reduce the load of the connection. This approach helps applications that are TCP\/IP based share networks and collectively agree on the maximum speed they can use for data transfer. In case of wide-area networks (WAN), the packet loss might represent some failure on intermediate device and the channel is often not congested. Therefore, the logic of reducing speed in case of packet loss is not appropriate for WAN connectivity.<\/p>\n\n\n\n

TCP\/IP Data Delivery Faults<\/h3>\n\n\n\n

Another problem in the WAN and use of DFSR, relates to the way TCP\/IP guarantees data delivery. First, it needs a recipient to acknowledge that packet arrived at the destination. Once a recipient gets a packet, it sends a confirmation packet to the sender acknowledging that it has received the specific packet. The time during which the packet travels from sender to receiver is called retransmission time (RTT). In the local network (LAN) it is below 0.01ms, but in WAN networks it can be as high as 800ms or more. Therefore, a receiver can wait up to a second or even more before it\u2019s able to send another packet. These TCP\/IP deficiencies are inherited by DFSR. Overcoming these bottlenecks requires the consideration of a DFSR alternative.<\/p>\n\n\n\n

Inability to Deliver Files to Multiple Locations<\/h3>\n\n\n\n

DFSR is limited in the ability to synchronize or deliver files to more than one destination. It is extremely rare that an organization needs to send or synchronize files just to one location or server. Usually, it is more than one destination server, in more than one location. It such a case, a common approach is to execute jobs one by one. DFSR sends files to one location, then to another.<\/p>\n\n\n\n

Poorly Optimized for Real Time File Replication<\/h3>\n\n\n\n

If you’re working with tens of millions of files and real-time change detection, you’ll find DFSR is not optimized for a large number of files. DFSR speed is usually very slow when you need to synchronize folders with few millions of files since it takes forever to scan through this folder, find changes and transfer them. A better approach would be to use real-time file system monitoring to pick up changes on the fly without the need to browse through the whole directory tree like Resilio Connect.<\/p>\n\n\n\n

Lack of Smart Data Routing<\/h3>\n\n\n\n

DFSR needs static ip:ports to establish a connection to different machines. If a machine has  a new IP:port or is not available, DFSR stops operation and needs a human to re-configure.<\/p>\n\n\n\n

Inability To Incorporate Scripting Into DFSR Workflows<\/h3>\n\n\n\n

Simply put, there is no way to have scripting around DFSR. If you need to build workflows beyond a simple “do something after the file arrives at destination”, there is no way to do so with DFSR.<\/p>\n\n\n\n

In contrast to DFSR, alternative replication & file distribution solutions Resilio Platform were developed to be faster under any network conditions and data volumes. This distributed file system replication service is specifically optimized to replicate large volumes of data, and works well with many small files, without any limits.  Besides, with a unique network protocol, it\u2019s sensitive to bandwidth changes and is smart enough to avoid network congestions or use full bandwidth when possible. Resilio Platform lets you take control over the file replication process, see its progress and evaluate the results.<\/p>\n\n\n\n

Resilio Platform data replication and synchronization is not limited to the Windows platform only, and can be easily configured as a cross-platform solution (Linux, OS X, iOS, and Android).<\/p>\n\n\n\n

 <\/div>\n\n\n\n

Solutions to Common DFSR Problems<\/h2>\n\n\n\n

How to make DFSR faster<\/h3>\n\n\n\n

Because DFSR\u2019s basic set of technologies is limited to delta encoding and compression, it means it\u2019s impossible to make DFSR faster. You would need to replace DFSR to get faster performance. If you are looking for a faster alternative to DFSR, consider Resilio Connect, which adds peer-to-peer data transfer, WAN line optimization, smart routing and real-time file system monitoring in order to speed up syncing for today\u2019s enterprise.<\/p>\n\n\n\n

DFSR and Transferring Large Files<\/h3>\n\n\n\n

Because Windows DFSR does not have an optimized way of calculating the checksum of a file, this leads to an extremely long time to calculate file differences, making large file transfers take that much longer. Unlike DFSR speed issues, our DFSR alternative, Resilio Connect, optimizes the checksum calculations quickly, allowing for files of all sizes to sync very fast.<\/p>\n\n\n\n

\"A<\/a>
A DFSR Alternative: Fast & Resilient P2P File Replication with Connect<\/figcaption><\/figure>\n\n\n\n

DFSR & End-To-End Encryption<\/h3>\n\n\n\n

One of the biggest drawbacks of Windows DFSR is that it lacks embedded traffic encryption, which makes it impossible to use DFSR without additional encryption. DFSR currently requires users to install and configure an additional encryption channel – a VPN. Any good DFSR alternative should include encryption within the product so that no additional products or set up is required. Our DFSR replacement, Resilio Connect, uses AES256 in CTR mode to encrypt all traffic that is sent between clients. This also includes both data and all of the control traffic.<\/p>\n\n\n\n

DFSR & Static IP Addresses<\/h3>\n\n\n\n

Another limitation of DFSR is that it requires a static IP and port address for a destination. This makes DFSR impossible to user in a dynamic network environment. With rsync, as soon as an IP address of a server is changed, then rsync will fail to operate. A good DFSR replacement, such as Resilio Connect, will use a dynamic routing approach that specifies when machine A and B need to exchange data. This means there\u2019s no human intervention necessary at all — both machines will use a tracker or multicast to discover the required IP:Port address on the fly.<\/p>\n\n\n\n

DFSR & WAN Network Connection<\/h3>\n\n\n\n

Because DFSR lacks WAN network support, it makes it impossible to use DFSR over long connections for offices located 3,000 miles or more apart. The long distance of the office creates a long travel time for the TCP packet, which increases the chances of packet loss due to equipment failure or congestion. As rsync is built on the TCP protocol, the sync speed will be slow when using these types of networks.<\/p>\n\n\n\n

To prevent packet loss over large distances, Resilio Platform uses WAN network support, allowing you to utilize 100% of the available bandwidth in your network totally independent of distance, latency, or loss. To achieve this, Resilio Platform uses UDP based protocol uTP2, which uses bulk packet transfer with selective acknowledgement of lost packets in transferring large files across vast distances.<\/p>\n\n\n\n

DFSR & Transferring Files to Several Destinations<\/h3>\n\n\n\n

Any good alternative to DFSR will use a peer-to-peer approach, which leverages networking between all available offices and significantly speeds up data transfer times. Using this approach splits each file into blocks, then sends these blocks independently. This means that each recipient can send the block to another recipient once it has been received. Using a peer-to-peer approach dramatically speeds up real time syncing operations, since we are not only transferring concurrently to several machines, but also using other network channels to help offload loads from a sender network channel. Resilio Platform uses this approach to deliver large files in real time quickly.<\/p>\n\n\n\n

DFSR & NAT<\/h3>\n\n\n\n

NAT, which is usually a firewall that hides server internal addresses and provides a connection with external IP addresses, makes it impossible for DFSR to connect to a server. In order to do this, you will need to open ports for each incoming connection on the device so that rsync can establish a connection. Resilio Connect, our DFSR replacement, uses NAT traversal techniques that allow a direct connection between computers without the need to open ports.<\/p>\n\n\n\n

Summary of Resilio Platform vs. DFSR<\/h2>\n\n\n\n

Here is a handy summary table of the features needed in a synchronization solution today, and how Resilio Platform stacks up against DFSR.<\/p>\n\n\n\n

 Features<\/strong><\/td>DFSR<\/strong><\/td>Resilio Connect<\/strong><\/td><\/tr>
Cross platform solution<\/span><\/td>No<\/span><\/td>Yes<\/span><\/td><\/tr>
Max number of servers<\/span><\/td>256 for each replication group<\/span><\/td>No limits<\/span><\/td><\/tr>
Max number of files<\/span><\/td>70 million (2012R2)
11 million (Server 2008)<\/span><\/td>		No limits<\/span><\/td><\/tr>
ACL replication<\/span><\/td>Yes<\/span><\/td>Yes<\/span><\/td><\/tr>
Max file size<\/span><\/td>250 Gb (2012R2)
64 Gb (Server 2008)<\/span><\/td>		No limits<\/span><\/td><\/tr>
Data deduplication<\/span><\/td>Yes<\/span><\/td>Yes<\/span><\/td><\/tr>
WAN acceleration<\/span><\/td>No<\/span><\/td>Yes<\/span><\/td><\/tr>
P2P replication<\/span><\/td>No<\/span><\/td>Yes<\/span><\/td><\/tr>
Time to replicate 3.72 Gb single file<\/span><\/td>4:00 min<\/span><\/td>1:39 min<\/span><\/td><\/tr>
Time to replicate 100k files of 4kb each<\/span><\/td>46 min<\/span><\/td>17 min<\/span><\/td><\/tr>
Delta encoding<\/span><\/td>Yes<\/span><\/td>Yes<\/span><\/td><\/tr>
Compression<\/span><\/td>Yes<\/span><\/td>Yes<\/span><\/td><\/tr>
In-transit encryption<\/span><\/td>No<\/span><\/td>Yes<\/span><\/td><\/tr>
WAN optimization<\/span><\/td>No<\/span><\/td>Yes<\/span><\/td><\/tr>
NAT traversal<\/span><\/td>No<\/span><\/td>Yes<\/span><\/td><\/tr>
10M+ files support<\/span><\/td>No<\/span><\/td>Yes<\/span><\/td><\/tr>
Very large folders<\/span><\/td>No<\/span><\/td>Yes<\/span><\/td><\/tr>
Real-time response to changes<\/span><\/td>Yes<\/span><\/td>Yes<\/span><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

<\/p>\n\n\n\n

Learn more about Resilio Connect’s DFSR Replacement<\/a> and how much faster and more reliable it can be. Or, schedule a demo<\/a> or start a free trial<\/a> to see for yourself. <\/strong><\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

What is DFSR? DFSR (sometimes written DFS-R), or distributed file system replication, is a feature of Windows Server for replicating files across several servers. Microsoft introduced this feature in Windows NT4.0 as an add-on, and it became a standard feature in Windows 2000 server and on. Basically, it was an attempt by Microsoft to solve […]<\/p>\n","protected":false},"author":54,"featured_media":10131,"comment_status":"closed","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"footnotes":""},"categories":[225,227],"tags":[142,191,187,269,291],"class_list":["post-9017","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dfsr","category-serversync","tag-featured-secondary","tag-replication","tag-resilio-connect","tag-show-on-dfsr-sidebar","tag-written-by-kos"],"yoast_head":"\nDFSR Alternative: Fast & Resilient File Replication | Resilio Blog<\/title>\n<meta name=\"description\" content=\"Are you looking for a DFSR alternative? Learn how Resilio Platform can completely replace your need for a DFS-R solution!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.resilio.com\/blog\/dfsr-alternative\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DFSR Alternative: Fast & Resilient File Replication | Resilio Blog\" \/>\n<meta property=\"og:description\" content=\"Are you looking for a DFSR alternative? 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