mirror of
https://github.com/borgbackup/borg.git
synced 2024-12-24 08:45:13 +00:00
159 lines
No EOL
15 KiB
HTML
159 lines
No EOL
15 KiB
HTML
.. IMPORTANT: this file is auto-generated from borg's built-in help, do not edit!
|
|
|
|
.. _borg_check:
|
|
|
|
borg check
|
|
----------
|
|
.. code-block:: none
|
|
|
|
borg [common options] check [options] [REPOSITORY_OR_ARCHIVE]
|
|
|
|
.. only:: html
|
|
|
|
.. class:: borg-options-table
|
|
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| **positional arguments** |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``REPOSITORY_OR_ARCHIVE`` | repository or archive to check consistency of |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| **optional arguments** |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``--repository-only`` | only perform repository checks |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``--archives-only`` | only perform archives checks |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``--verify-data`` | perform cryptographic archive data integrity verification (conflicts with ``--repository-only``) |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``--repair`` | attempt to repair any inconsistencies found |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``--save-space`` | work slower, but using less space |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``--max-duration SECONDS`` | do only a partial repo check for max. SECONDS seconds (Default: unlimited) |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| .. class:: borg-common-opt-ref |
|
|
| |
|
|
| :ref:`common_options` |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| **Archive filters** — Archive filters can be applied to repository targets. |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``-P PREFIX``, ``--prefix PREFIX`` | only consider archive names starting with this prefix. |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``-a GLOB``, ``--glob-archives GLOB`` | only consider archive names matching the glob. sh: rules apply, see "borg help patterns". ``--prefix`` and ``--glob-archives`` are mutually exclusive. |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``--sort-by KEYS`` | Comma-separated list of sorting keys; valid keys are: timestamp, name, id; default is: timestamp |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``--first N`` | consider first N archives after other filters were applied |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
| | ``--last N`` | consider last N archives after other filters were applied |
|
|
+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
|
|
.. raw:: html
|
|
|
|
<script type='text/javascript'>
|
|
$(document).ready(function () {
|
|
$('.borg-options-table colgroup').remove();
|
|
})
|
|
</script>
|
|
|
|
.. only:: latex
|
|
|
|
REPOSITORY_OR_ARCHIVE
|
|
repository or archive to check consistency of
|
|
|
|
|
|
optional arguments
|
|
--repository-only only perform repository checks
|
|
--archives-only only perform archives checks
|
|
--verify-data perform cryptographic archive data integrity verification (conflicts with ``--repository-only``)
|
|
--repair attempt to repair any inconsistencies found
|
|
--save-space work slower, but using less space
|
|
--max-duration SECONDS do only a partial repo check for max. SECONDS seconds (Default: unlimited)
|
|
|
|
|
|
:ref:`common_options`
|
|
|
|
|
|
|
Archive filters
|
|
-P PREFIX, --prefix PREFIX only consider archive names starting with this prefix.
|
|
-a GLOB, --glob-archives GLOB only consider archive names matching the glob. sh: rules apply, see "borg help patterns". ``--prefix`` and ``--glob-archives`` are mutually exclusive.
|
|
--sort-by KEYS Comma-separated list of sorting keys; valid keys are: timestamp, name, id; default is: timestamp
|
|
--first N consider first N archives after other filters were applied
|
|
--last N consider last N archives after other filters were applied
|
|
|
|
|
|
Description
|
|
~~~~~~~~~~~
|
|
|
|
The check command verifies the consistency of a repository and the corresponding archives.
|
|
|
|
check --repair is a potentially dangerous function and might lead to data loss
|
|
(for kinds of corruption it is not capable of dealing with). BE VERY CAREFUL!
|
|
|
|
Pursuant to the previous warning it is also highly recommended to test the
|
|
reliability of the hardware running this software with stress testing software
|
|
such as memory testers. Unreliable hardware can also lead to data loss especially
|
|
when this command is run in repair mode.
|
|
|
|
First, the underlying repository data files are checked:
|
|
|
|
- For all segments, the segment magic header is checked.
|
|
- For all objects stored in the segments, all metadata (e.g. CRC and size) and
|
|
all data is read. The read data is checked by size and CRC. Bit rot and other
|
|
types of accidental damage can be detected this way.
|
|
- In repair mode, if an integrity error is detected in a segment, try to recover
|
|
as many objects from the segment as possible.
|
|
- In repair mode, make sure that the index is consistent with the data stored in
|
|
the segments.
|
|
- If checking a remote repo via ``ssh:``, the repo check is executed on the server
|
|
without causing significant network traffic.
|
|
- The repository check can be skipped using the ``--archives-only`` option.
|
|
- A repository check can be time consuming. Partial checks are possible with the
|
|
``--max-duration`` option.
|
|
|
|
Second, the consistency and correctness of the archive metadata is verified:
|
|
|
|
- Is the repo manifest present? If not, it is rebuilt from archive metadata
|
|
chunks (this requires reading and decrypting of all metadata and data).
|
|
- Check if archive metadata chunk is present; if not, remove archive from manifest.
|
|
- For all files (items) in the archive, for all chunks referenced by these
|
|
files, check if chunk is present. In repair mode, if a chunk is not present,
|
|
replace it with a same-size replacement chunk of zeroes. If a previously lost
|
|
chunk reappears (e.g. via a later backup), in repair mode the all-zero replacement
|
|
chunk will be replaced by the correct chunk. This requires reading of archive and
|
|
file metadata, but not data.
|
|
- In repair mode, when all the archives were checked, orphaned chunks are deleted
|
|
from the repo. One cause of orphaned chunks are input file related errors (like
|
|
read errors) in the archive creation process.
|
|
- In verify-data mode, a complete cryptographic verification of the archive data
|
|
integrity is performed. This conflicts with ``--repository-only`` as this mode
|
|
only makes sense if the archive checks are enabled. The full details of this mode
|
|
are documented below.
|
|
- If checking a remote repo via ``ssh:``, the archive check is executed on the
|
|
client machine because it requires decryption, and this is always done client-side
|
|
as key access is needed.
|
|
- The archive checks can be time consuming; they can be skipped using the
|
|
``--repository-only`` option.
|
|
|
|
The ``--max-duration`` option can be used to split a long-running repository check
|
|
into multiple partial checks. After the given number of seconds the check is
|
|
interrupted. The next partial check will continue where the previous one stopped,
|
|
until the complete repository has been checked. Example: Assuming a complete check took 7
|
|
hours, then running a daily check with --max-duration=3600 (1 hour) resulted in one
|
|
completed check per week.
|
|
|
|
Attention: A partial --repository-only check can only do way less checking than a full
|
|
--repository-only check: only the non-cryptographic checksum checks on segment file
|
|
entries are done, while a full --repository-only check would also do a repo index check.
|
|
A partial check cannot be combined with the ``--repair`` option. Partial checks
|
|
may therefore be useful only with very large repositories where a full check would take
|
|
too long.
|
|
Doing a full repository check aborts a partial check; the next partial check will restart
|
|
from the beginning.
|
|
|
|
The ``--verify-data`` option will perform a full integrity verification (as opposed to
|
|
checking the CRC32 of the segment) of data, which means reading the data from the
|
|
repository, decrypting and decompressing it. This is a cryptographic verification,
|
|
which will detect (accidental) corruption. For encrypted repositories it is
|
|
tamper-resistant as well, unless the attacker has access to the keys. It is also very
|
|
slow. |