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Remote Differential Compression

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the rest of the file to become misaligned to the original content) the blocks used for comparison are not based on static arbitrary cut points but on cut points defined by the contents of each file segment. This means that if a part of a file changes in length, or blocks of the contents get moved to other parts of the file, the block boundaries for the parts that have not changed remain fixed related to the contents, and thus the series of fingerprints for those blocks do not change, they just change position. By comparing all hashes in a file to the hashes for the same file at the other end of the replication pair, RDC is able to identify which blocks of the file have changed and which have not, even if the contents of the file have been significantly reshuffled. Since comparing large files could imply making large numbers of signature comparisons, the algorithm is recursively applied to the hash sets to detect which blocks of hashes have changed or moved around, significantly reducing the amount of data that needs to be transmitted for comparing files.
2043: 136:(BDC), which is designed to operate only on known versions of a single file, RDC does not make assumptions about file similarity or versioning. The differences between files are computed on the fly, therefore RDC is suitable for efficient synchronization of files that have been updated independently, where network bandwidth is small, or where the files are large but the differences between them are small. 22: 2054: 158:
file, MSRDC.DLL, which will be present in the %SYSTEMROOT%\System32 directory if and only if RDC is enabled. Very little software is available which makes use of it, particularly on non-server systems. According to Internet rumor, enabling RDC significantly slows local file transfers, and it should
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The algorithm used is based on fingerprinting blocks on each file locally at both ends of the replication partners. Since many types of file changes can cause the file contents to move without other significant change (for example, a small insertion or deletion at the beginning of a file can cause
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Later versions of Windows support cross-file RDC, which finds files similar to the one being replicated, and uses blocks of the similar files that are identical to the replicating file to minimize data transferred over the WAN. Cross-file RDC can use blocks of up to five similar files.
342: 125:) is a client–server synchronization algorithm that allows the contents of two files to be synchronized by communicating only the differences between them. It was introduced with Microsoft 322: 39: 1058: 1073: 1238: 315: 218: 129:
R2, is included with later Windows client and server operating systems, but by 2019 is not being developed and is not used by any Microsoft product.
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Microsoft TechNet: DFS Replication: Frequently Asked Questions, section "What is cross-file RDC?", pub. 16 October 2006, updated 30 January 2013
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web page disputes this in great detail, despite frequent anecdotal posts of its removal having worked to restore transfer speeds.
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Remote Differential Compression (aka rsync algorithm for Windows), David Jade, Programming, 15 February 2013
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protocol, but with some useful innovations, in particular the recursive algorithm and cross-file RDC.
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Optimizing File Replication over Limited-Bandwidth Networks using Remote Differential Compression
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RDC is implemented in Windows operating systems by a
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Unsourced material may be challenged and removed. 147:RDC is similar in many ways to the older (1996) 316: 8: 2053: 1577: 323: 309: 301: 175:, RDC support was included in the section 106:Learn how and when to remove this message 200: 1930:Next-Generation Secure Computing Base 291:About Remote Differential Compression 7: 44:adding citations to reliable sources 1059:Distributed Transaction Coordinator 177:Features we’re no longer developing 1390:User Interface Privilege Isolation 14: 55:"Remote Differential Compression" 2052: 2042: 2041: 171:With the release of Microsoft's 20: 1119:Remote Differential Compression 261:Microsoft Windows IT Pro Center 119:Remote Differential Compression 31:needs additional citations for 1975:Windows System Assessment Tool 1: 1264:Open XML Paper Specification 1124:Remote Installation Services 332:Microsoft Windows components 1416:Windows Subsystem for Linux 1375:Mandatory Integrity Control 1129:Windows Deployment Services 926:Wireless Zero Configuration 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Index


verification
improve this article
adding citations to reliable sources
"Remote Differential Compression"
news
newspapers
books
scholar
JSTOR
Learn how and when to remove this message
Windows Server 2003
Binary Delta Compression
rsync
DLL
Microsoft TechNet
Windows Server 2019
DFS replication
Microsoft TechNet: DFS Replication: Frequently Asked Questions, section "What is cross-file RDC?", pub. 16 October 2006, updated 30 January 2013
Remote Differential Compression (aka rsync algorithm for Windows), David Jade, Programming, 15 February 2013
"Debunking the Vista Remote Differential Compression Myth"
"Features removed or planned for removal in Windows Server 2019"
Distributed File System
About Remote Differential Compression
Optimizing File Replication over Limited-Bandwidth Networks using Remote Differential Compression
v
t
e
Microsoft Windows components
APIs

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