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Scale your Aiven service disks automatically
============================================

Discover the service disk autoscaler and its capabilities. Find out it works and how to use it with your Aiven for service.
Discover the service disk autoscaler and its capabilities. Find out how it works and how to use it with your Aiven for service.

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About disk autoscaling
----------------------

.. seealso::
.. topic:: Pricing

For more information on service disk autoscaler, check.
Costs of using disk autoscaler depend on your service type and plan. You don't pay a fixed amount monthly but you're charged based on your actual usage. For information on the costs of using disk autoscaler, check the same for dynamic disk sizing (DDS) in `Aiven Plans and Pricing <https://aiven.io/pricing?product=kafka>`_ or contact us at [email protected].

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Why use it
----------
Why use disk autoscaling

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------------------------

Service disk autoscaler increases disk storage capacity automatically when the disk is running out of space. Disk autoscaling allows you to improve the cost-efficiency of operating your Aiven services: you can start with a relatively small-sized disk and only have it scaled up when needed with no risk of running out of disk space at any point.

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How it works
------------

.. topic:: Flow of actions
There are a few steps illustratig how disk autoscaler works:

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1. You create an disk autoscaler integration endpoint in your Aiven project setting the maximum additional storage at the same time.

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2. You enable a disk autoscaler integration for your service using the new disk autoscaler integration endpoint.

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3. From that point onward, the evaluation of disk space availability for your service is done every 30 seconds.
4. When disk storage consumption reaches the treshold for a specific service, disk autoscaler increases available storage space by 10% every time taking the currently-used service plan as a baseline.

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.. seealso::
.. topic:: AUTOSCALE THRESHOLDS PER SERVICE TYPE

For more information on how service disk autoscaler works, check
The treshold at which disk autoscaling is triggered is a percentage of the available disk storage capacity and depends on a service type:

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* Aiven for Apache Cassandra®: 35% of the available disk storage capacity
* Aiven for OpenSearch®: 75% of the available disk storage capacity
* All the other Aiven service types: 85% of the available disk storage capacity

Prerequisites
-------------

* Aiven organization, project, and service (Aiven for PostgreSQL)
* Depending on what interface you'd like to use for interacting with service disk autoscaler, you might need the following:
* Aiven organization, project, and service up and running
* :doc:`Dynamic disk sizing (DDS) </docs/platform/concepts/dynamic-disk-sizing>` supported for the service plan and the cloud hosting the service
* Role of the operator for your Aiven organization, project, and service
* Depending on what interface you'd like to use for interacting with disk autoscaler:

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* Access to `Aiven Console <https://console.aiven.io/>`_
* SQL
* `Aiven API <https://api.aiven.io/doc/>`_
* :doc:`Aiven CLI client </docs/tools/cli>`

Enable service disk autoscaler
-------------------
Enable disk autoscaler

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----------------------

You can enable the extension in `Aiven Console <https://console.aiven.io/>`_, using Aiven API, or Aiven CLI client.
You can enable disk autoscaling in `Aiven Console <https://console.aiven.io/>`_, using Aiven API, or Aiven CLI client.

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Enable in Aiven Console
~~~~~~~~~~~~~~~~~~~~~~~

.. important::

In `Aiven Console <https://console.aiven.io/>`_, you can enable service disk autoscaler at the service level only. To enable the extension on a database or for a user, you need to use SQL.

1. Log in to `Aiven Console <https://console.aiven.io/>`_ and navigate to a desired organization, project, and service.
2. On the **Overview** page of your service, navigate to **Advanced configuration** > **Configure** > **Add configuration options**.
3. Find the **service disk autoscaler.enabled** parameter, set it to **true**, and select **Save configuration**.

Enable with Aiven API
~~~~~~~~~~~~~~~~~~~~~

You can use `Aiven API <https://api.aiven.io/doc/>`_ to enable service disk autoscaler on your service. Call the
To enable disk autoscaler on your service via `Aiven API <https://api.aiven.io/doc/>`_, call the

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`ServiceUpdate <https://api.aiven.io/doc/#tag/Service/operation/ServiceUpdate>`_ endpoint passing ``{"service disk autoscaler": {"enabled": true}}`` in the ``user_config`` object.

Enable with Aiven CLI

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~~~~~~~~~~~~~~~~~~~~~

You can use the :doc:`Aiven CLI client </docs/tools/cli>` to enable service disk autoscaler for your service by running the following command:
You can use the :doc:`Aiven CLI client </docs/tools/cli>` to enable disk autoscaler for your service by running the following command:

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.. code-block:: bash
avn service update -c service disk autoscaler.enabled=true SERVICE_NAME
Configure service disk autoscaler
----------------------

service disk autoscaler is pre-configured with default settings but you can modify its configuration parameters in `Aiven Console <https://console.aiven.io/>`_, using Aiven API, or Aiven CLI.

You might want to configure the following parameters:
Configure disk autoscaler

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-------------------------

* ``service disk autoscaler.enabled`` (to enable or disable the service disk autoscaler extension)
* ``service disk autoscaler.track_pg_catalog`` (to enable or disable service disk autoscaler on pg_catalog)
* ``service disk autoscaler.sample_rate`` (to set the granularity of service disk autoscaler analysis and statistics returned)
* Allowed values: ``0`` - ``1``, where ``1`` means analysis and statistics on every single query, and ``0`` means there are no queries analysed.
* Default value: ``1/max_connections``
* ``service disk autoscaler.track_constants`` (to enable or disable service disk autoscaler on constants)

.. topic:: Sample service disk autoscaler configuration

.. code-block:: bash
service disk autoscaler.enabled = on
service disk autoscaler.sample_rate = 0.1
.. seealso::

For more confuguration options, check `powa-team's service disk autoscaler configuration <https://github.com/powa-team/service disk autoscaler>`_.
After enabling disk autoscaler, any time later you can update the maximum additional disk storage that can be added to your original service storage. For that purpose, you can use `Aiven Console <https://console.aiven.io/>`_, Aiven API, or Aiven CLI.

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Configure in Aiven Console
~~~~~~~~~~~~~~~~~~~~~~~~~~

.. important::

In `Aiven Console <https://console.aiven.io/>`_, you can configure service disk autoscaler at the service level only. To configure the extension on a database or for a user, you need to use SQL.

1. Log in to `Aiven Console <https://console.aiven.io/>`_ and navigate to a desired organization, project, and service.
2. On the **Overview** page of your service, navigate to **Advanced configuration** > **Configure** > **Add configuration options**.
3. Find a desired service disk autoscaler parameter (all prefixed with ``service disk autoscaler``), set its value as needed, and select **Save configuration**.

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Configure with Aiven API
~~~~~~~~~~~~~~~~~~~~~~~~

You can use `Aiven API <https://api.aiven.io/doc/>`_ to configure service disk autoscaler on your service. Call the
You can use `Aiven API <https://api.aiven.io/doc/>`_ to configure disk autoscaler on your service. Call the
`ServiceUpdate <https://api.aiven.io/doc/#tag/Service/operation/ServiceUpdate>`_ endpoint passing desired service disk autoscaler parameters in the ``user_config`` object.

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Configure with Aiven CLI

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~~~~~~~~~~~~~~~~~~~~~~~~

You can use the :doc:`Aiven CLI client </docs/tools/cli>` to configure service disk autoscaler on your service by running the following command:
You can use the :doc:`Aiven CLI client </docs/tools/cli>` to configure disk autoscaler on your service by running the following command:

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.. code-block:: bash
avn service update -c service disk autoscaler.PARAMETER_NAME=PARAMETER_VALUE SERVICE_NAME
Disable service disk autoscaler
--------------------
Disable disk autoscaler

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-----------------------

You can disable the extension in `Aiven Console <https://console.aiven.io/>`_, using Aiven API, or Aiven CLI.
You can disable disk autoscaling in `Aiven Console <https://console.aiven.io/>`_, using Aiven API, or Aiven CLI client.

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Disable in Aiven Console
~~~~~~~~~~~~~~~~~~~~~~~~

.. important::

In `Aiven Console <https://console.aiven.io/>`_, you can disable service disk autoscaler at the service level only, which deactivates the extension globally for the whole service: all the databases and user roles in this service. To disable the extension on a particular database or for a specific user only, you need to use SQL.

1. Log in to `Aiven Console <https://console.aiven.io/>`_ and navigate to a desired organization, project, and service.
2. On the **Overview** page of your service, navigate to **Advanced configuration** > **Configure** > **Add configuration options**.
3. Find the **service disk autoscaler.enabled** parameter, set it to **false**, and select **Save configuration**.

Disable with Aiven API
~~~~~~~~~~~~~~~~~~~~~~

You can use `Aiven API <https://api.aiven.io/doc/>`_ to disable service disk autoscaler on your service. Call the
You can use `Aiven API <https://api.aiven.io/doc/>`_ to disable disk autoscaler on your service. Call the
`ServiceUpdate <https://api.aiven.io/doc/#tag/Service/operation/ServiceUpdate>`_ endpoint passing ``{"service disk autoscaler": {"enabled": false}}`` in the ``user_config`` object.

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Disable with Aiven CLI

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~~~~~~~~~~~~~~~~~~~~~~

You can use the :doc:`Aiven CLI client </docs/tools/cli>` to disable service disk autoscaler on your service by running the following command:
You can use the :doc:`Aiven CLI client </docs/tools/cli>` to disable disk autoscaler on your service by running the following command:

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.. code-block:: bash
avn service update -c service disk autoscaler.enabled=false SERVICE_NAME
Related reading
---------------

:doc:`Dynamic disk sizing (DDS) </docs/platform/concepts/dynamic-disk-sizing>`

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