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docs: add information about chunk order option for datastores

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Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
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Dominik Csapak 2022-10-20 09:40:54 +02:00 committed by Wolfgang Bumiller
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docs/storage.rst
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@ -315,3 +315,26 @@ There are a few per-datastore options:
* :ref:`Notifications <maintenance_notification>`
* :ref:`Maintenance Mode <maintenance_mode>`
* Verification of incoming backups
Tuning
^^^^^^
There are some tuning related options for the datastore that are more advanced
and only available on the CLI:
* ``chunk-order``: Chunk order for verify & tape backup:
You can specify the order in which Proxmox Backup Server iterates the chunks
when doing a verify or backing up to tape. The two options are:
- `inode` (default): Sorts the chunks by inode number of the filesystem before iterating
over them. This should be fine for most storages, especially spinning disks.
- `none` Iterates the chunks in the order they appear in the
index file (.fidx/.didx). While this might slow down iterating on many slow
storages, on very fast ones (for example: NVMEs) the collecting and sorting
can take more time than gained through the sorted iterating.
This option can be set with:
.. code-block:: console
# proxmox-backup-manager datastore update <storename> --tuning 'chunk-order=none'