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31 lines
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31 lines
1.5 KiB
HTML
File systems
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~~~~~~~~~~~~
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We strongly recommend against using Borg (or any other database-like
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software) on non-journaling file systems like FAT, since it is not
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possible to assume any consistency in case of power failures (or a
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sudden disconnect of an external drive or similar failures).
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While Borg uses a data store that is resilient against these failures
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when used on journaling file systems, it is not possible to guarantee
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this with some hardware -- independent of the software used. We don't
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know a list of affected hardware.
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If you are suspicious whether your Borg repository is still consistent
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and readable after one of the failures mentioned above occurred, run
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``borg check --verify-data`` to make sure it is consistent.
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.. rubric:: Requirements for Borg repository file systems
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- Long file names
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- At least three directory levels with short names
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- Typically, file sizes up to a few hundred MB.
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Large repositories may require large files (>2 GB).
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- Up to 1000 files per directory (10000 for repositories initialized with Borg 1.0)
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- rename(2) / MoveFile(Ex) should work as specified, i.e. on the same file system
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it should be a move (not a copy) operation, and in case of a directory
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it should fail if the destination exists and is not an empty directory,
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since this is used for locking.
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- Hardlinks are needed for :ref:`borg_upgrade` (if ``--inplace`` option is not used).
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Also hardlinks are used for more safe and secure file updating (e.g. of the repo
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config file), but the code tries to work also if hardlinks are not supported.
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