We have a rsync'd filesystem which generally contains very large files that only
grow.
We've specifically used the --append option to handle these files - since
otherwise rsync is effectively CPU bound the whole time.
I'd always assumed that any files that were simply modified (without a change in
length) would be handled under the existing rsync logic. However it appears
that once --append is selected then existing files are never copied/updated
based on timestamp, only when the length changes.
Is there any option that I've overlooked whereby I can force rsync to
synchronise modified files (in addition to handling appended files).
I could do two passes (--append followed by normal non-append), but the second
pass is likely to also synchronise files that are appended to and rsync will end
up taking 8 hours to complete.
Maybe my best option is to use two rsync passes, and add use the
--max-size/--min-size to ensure that append is only applied to large files, and
to apply standard rsync logic for smaller files. This assumes that I can
guarantee that files beyond a specific size will only be appended to.
Thanks for any assistance.
Mark
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