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faq: we do not implement futile attempts of ETA / progress displays

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(cherry picked from commit fe08437337)
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Thomas Waldmann 2017-10-05 22:19:39 +02:00
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docs/faq.rst
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@ -682,6 +682,31 @@ the corruption is caused by a one time event such as a power outage,
running `borg check --repair` will fix most problems.
Why isn't there more progress / ETA information displayed?
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Some borg runs take quite a bit, so it would be nice to see a progress display,
maybe even including a ETA (expected time of "arrival" [here rather "completion"]).
For some functionality, this can be done: if the total amount of work is more or
less known, we can display progress. So check if there is a ``--progress`` option.
But sometimes, the total amount is unknown (e.g. for ``borg create`` we just do
a single pass over the filesystem, so we do not know the total file count or data
volume before reaching the end). Adding another pass just to determine that would
take additional time and could be incorrect, if the filesystem is changing.
Even if the fs does not change and we knew count and size of all files, we still
could not compute the ``borg create`` ETA as we do not know the amount of changed
chunks, how the bandwidth of source and destination or system performance might
fluctuate.
You see, trying to display ETA would be futile. The borg developers prefer to
rather not implement progress / ETA display than doing futile attempts.
See also: https://xkcd.com/612/
Miscellaneous
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