Updating with a delta file linux


28-Dec-2020 07:48

This option turns off this "quick check" behavior, causing all files to be updated.This modifies rsync's "quick check" algorithm for finding files that need to be transferred, changing it from the default of transferring files with either a changed size or a changed last-modified time to just looking for files that have changed in size.This suppresses the message-of-the-day (MOTD) text, but it also affects the list of modules that the daemon sends in response to the "rsync host::" request (due to a limitation in the rsync protocol), so omit this option if you want to request the list of modules from the daemon.Normally rsync will skip any files that are already the same size and have the same modification timestamp.The sending side generates its checksums while it is doing the file-system scan that builds the list of the available files.The receiver generates its checksums when it is scanning for changed files, and will checksum any file that has the same size as the corresponding sender's file: files with either a changed size or a changed checksum are selected for transfer. It is a quick way of saying you want recursion and want to preserve almost everything (with -H being a notable omission).This is normally 0 (for an exact match), but you may find it useful to set this to a larger value in some situations.In particular, when transferring to or from an MS Windows FAT filesystem (which represents times with a 2-second resolution), --modify-window=1 is useful (allowing times to differ by up to 1 second).

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It is famous for its delta-transfer algorithm, which reduces the amount of data sent over the network by sending only the differences between the source files and the existing files in the destination.This changes the way rsync checks if the files have been changed and are in need of a transfer.