Rsync options –update and –append-verify
hancooper at protonmail.com
Sat Sep 11 22:50:24 UTC 2021
I am struggling to understand exactly what the rsync options --update and --append-verify do.
Doing info rsync gives
This forces rsync to skip any files which exist on the destina‐
tion and have a modified time that is newer than the source
file. (If an existing destination file has a modification time
equal to the source file’s, it will be updated if the sizes are
This works just like the --append option, but the existing data
on the receiving side is included in the full-file checksum
verification step, which will cause a file to be resent if the
final verification step fails (rsync uses a normal, non-append‐
ing --inplace transfer for the resend).
I am using rsync to transfer directories recursively. There are times where I have to stop the rsync transfer, and resume the transfer a few hours or days later, without affecting the already transferred files at destination.
I also got some files that return errors by rsync, such as
rsync: read errors mapping "/media/hc1/a1-chaos/amvib/IACL-2017-07-19T00:00:00-2017-07-19T23:59:59.mseed": Input/output error (5)
I would like to retry the transfer of these files, at a later time too, without affecting the files that had been transferred successfully.
More information about the rsync