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Merge "Coho Data: QoS support documentation"

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doc/config-reference/source/block-storage/drivers/coho-data-driver.rst
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@ -26,6 +26,34 @@ Supported operations
* Create a thin provisioned volume.
* Get volume statistics.
Coho Data QoS support
~~~~~~~~~~~~~~~~~~~~~
QoS support for the Coho Data driver includes the ability to set the
following capabilities in the OpenStack Block Storage API
``cinder.api.contrib.qos_specs_manage`` QoS specs extension module:
* **maxIOPS** - The maximum number of IOPS allowed for this volume.
* **maxMBS** - The maximum throughput allowed for this volume.
The QoS keys above must be created and associated with a volume type.
For information about how to set the key-value pairs and associate
them with a volume type, run the following commands:
.. code-block:: console
$ cinder help qos-create
$ cinder help qos-key
$ cinder help qos-associate
.. note::
If you change a volume type with QoS to a new volume type
without QoS, the QoS configuration settings will be removed.
System requirements
~~~~~~~~~~~~~~~~~~~