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docs: point out tuning options for borg create, fixes #3239

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Thomas Waldmann 2017-11-25 15:21:43 +01:00
parent 4835dce913
commit 520a6a2ef1
1 changed files with 6 additions and 0 deletions
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src/borg/archiver.py
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@ -2761,6 +2761,12 @@ def define_archive_filters_group(subparser, *, sort_by=True, first_last=True):
it had before a content change happened. This can be used maliciously as well as
well-meant, but in both cases mtime based cache modes can be problematic.
By default, borg tries to archive all metadata that it supports archiving.
If that is not what you want or need, there are some tuning options:
- --nobsdflags (getting bsdflags has a speed penalty under Linux)
- --noatime (if atime changes frequently, the metadata stream will dedup badly)
The mount points of filesystems or filesystem snapshots should be the same for every
creation of a new archive to ensure fast operation. This is because the file cache that
is used to determine changed files quickly uses absolute filenames.