Hi all,
rsync seems slow to copy large files. The issue is not related to the
transfer itself, which is quite fast, but to the discovery of different
blocks.
For example, transferring a big (multi-GB) file from src (remote) to dst
(local) with "--inplace" (to avoid a whole-file copy on dst) shows the
following:
- if dst does not have a local file, or if -W was given, the copy
immediately starts (but it clearly needs to transfer all blocks);
- if dst has a previous file version (and -W was not given), first dst
reads the entire file, then src does the same, next different blocks are
copied and finally dst re-read the entire file.
As dst and src file scans do not happen concurrently, and including the
last whole-file read by dst, copy time is vastly increased at about 3x
compared to an optimized process (with concurrent scans and without the
final read).
Am I missing something? Can rsync be faster for large-file copies?
Regards.
--
Danti Gionatan
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