The Delta Replication page in the Edit File Synchronization Job dialog allows you to specify the delta-replication options to use for the selected File Synchronization job. Delta-level replication is a byte replication technology that enables block/byte level synchronization for a File Synchronization job. Through this feature, Peer Management Center is able to transmit only the bytes/blocks of a file that have changed instead of transferring the entire file. This results in much lower network bandwidth utilization, which can be an enormous benefit if you are transferring files across a slow WAN or VPN, as well as across a high-volume LAN.
Delta-level replication is enabled on a per File Synchronization job basis and generally affects all files in the watch set. You will only benefit from delta-level replication for files that do not change much between file modifications, which includes most document editing programs.
To modify delta-level replication options:
1.Modify the following the fields as necessary.
Enable Delta-Level Replication |
Select to enable delta encoded file transfers which only sends the file blocks that are different between source and target(s). If this is disabled, the standard file copy method will be used to synchronize files. |
Checksum Transfer Size (KB) |
Enter the block in kilobytes used to transfer checksums from target to source at one time. Larger sizes will result in faster checksum transfer, but will consume more memory on the Peer Agents |
Delta Block Transfer Size (KB) |
Enter the block size in kilobytes used to transfer delta encoded data from source to target at one time. Larger sizes will result in faster overall file transfers but will consume more memory on the Peer Agents. |
Minimum File Size (KB) |
Enter the minimum size of files in kilobytes to perform delta encoding for. If a file is less than this size, then delta encoding will not be performed. |
Minimum File Size Percentage Target/Source |
Enter the minimum allowed file size difference between source and target, as a percentage, to perform delta encoding. If the target file size is less than this percentage of the source file size, then delta encoding will not be performed. |
Excluded File Extensions |
Enter a comma-separated list of file extension patterns to be excluded from delta encoding, e.g., zip, jpg, png. In general, compressed files should be excluded from delta encoding and the most popular compressed file formats are excluded by default. |
Excluded File Name Patterns |
Enter a list of file name patterns to be excluded from delta encoding. If a file name matches any pattern in this list, then it will be excluded from delta encoding transfers and a regular file transfer will be performed. See File and Folder Filters for more information on specifying wildcard expressions. |
2.Click OK to close the Edit wizard or select another configuration item to modify.