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docs/administration-guide.rst: improve section "Backup Content"

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Dietmar Maurer 2019-12-03 09:04:49 +01:00
parent 2938a0a788
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docs/administration-guide.rst
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@ -12,7 +12,7 @@ Backup Content
When doing deduplication, there are different strategies to get
optimal results in terms of performance and/or deduplication rates.
Depending on the type of data, one can split it into fixed or variable
Depending on the type of data, one can split data into fixed or variable
sized chunks.
Fixed sized chunking needs almost no CPU performance, and is used to
@ -24,8 +24,8 @@ good deduplication rates for file archives.
Therefore, the backup server supports both strategies.
File Archives
^^^^^^^^^^^^^
File Archives: ``<name>.pxar``
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. see https://moinakg.wordpress.com/2013/06/22/high-performance-content-defined-chunking/
@ -34,8 +34,8 @@ the :ref:`pxar-format`, split into variable sized chunks. The format
is specially optimized to achieve good deduplication rates.
Image Archives
^^^^^^^^^^^^^^
Image Archives: ``<name>.img``
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This is used for virtual machine images and other large binary
data. Content is split into fixed sized chunks.
@ -51,6 +51,21 @@ configuration data. Larger files should be stored as image archive.
file archive to store whole directory trees.
Catalog File: ``catalog.pcat1``
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The catalog file is basically an index for file archive. It contains
the list of files, and is used to speedup search operations.
The Manifest: ``index.json``
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The manifest contains the list of all backup files, including
file sizes and checksums. It is used to verify the consistency of a
backup.
Backup Type
~~~~~~~~~~~