mirror of https://github.com/borgbackup/borg.git
77 lines
3.6 KiB
HTML
77 lines
3.6 KiB
HTML
.. _borg_check:
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borg check
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----------
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::
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usage: borg check [-h] [-v] [--debug] [--lock-wait N] [--show-version]
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[--show-rc] [--no-files-cache] [--umask M]
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[--remote-path PATH] [--repository-only] [--archives-only]
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[--repair] [--save-space] [--last N] [-P PREFIX]
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[REPOSITORY_OR_ARCHIVE]
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Check repository consistency
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positional arguments:
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REPOSITORY_OR_ARCHIVE
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repository or archive to check consistency of
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optional arguments:
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-h, --help show this help message and exit
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-v, --verbose, --info
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enable informative (verbose) output, work on log level
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INFO
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--debug enable debug output, work on log level DEBUG
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--lock-wait N wait for the lock, but max. N seconds (default: 1).
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--show-version show/log the borg version
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--show-rc show/log the return code (rc)
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--no-files-cache do not load/update the file metadata cache used to
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detect unchanged files
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--umask M set umask to M (local and remote, default: 0077)
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--remote-path PATH set remote path to executable (default: "borg")
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--repository-only only perform repository checks
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--archives-only only perform archives checks
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--repair attempt to repair any inconsistencies found
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--save-space work slower, but using less space
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--last N only check last N archives (Default: all)
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-P PREFIX, --prefix PREFIX
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only consider archive names starting with this prefix
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Description
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~~~~~~~~~~~
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The check command verifies the consistency of a repository and the corresponding archives.
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First, the underlying repository data files are checked:
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- For all segments the segment magic (header) is checked
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- For all objects stored in the segments, all metadata (e.g. crc and size) and
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all data is read. The read data is checked by size and CRC. Bit rot and other
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types of accidental damage can be detected this way.
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- If we are in repair mode and a integrity error is detected for a segment,
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we try to recover as many objects from the segment as possible.
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- In repair mode, it makes sure that the index is consistent with the data
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stored in the segments.
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- If you use a remote repo server via ssh:, the repo check is executed on the
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repo server without causing significant network traffic.
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- The repository check can be skipped using the --archives-only option.
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Second, the consistency and correctness of the archive metadata is verified:
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- Is the repo manifest present? If not, it is rebuilt from archive metadata
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chunks (this requires reading and decrypting of all metadata and data).
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- Check if archive metadata chunk is present. if not, remove archive from
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manifest.
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- For all files (items) in the archive, for all chunks referenced by these
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files, check if chunk is present (if not and we are in repair mode, replace
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it with a same-size chunk of zeros). This requires reading of archive and
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file metadata, but not data.
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- If we are in repair mode and we checked all the archives: delete orphaned
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chunks from the repo.
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- if you use a remote repo server via ssh:, the archive check is executed on
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the client machine (because if encryption is enabled, the checks will require
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decryption and this is always done client-side, because key access will be
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required).
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- The archive checks can be time consuming, they can be skipped using the
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--repository-only option.
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