openstack/openstack-manuals
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Merge "Support over subscription and thin provisioning for ScaleIO"

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Jenkins 2016-09-09 04:35:46 +00:00 committed by Gerrit Code Review
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doc/config-reference/source/block-storage/drivers/emc-scaleio-driver.rst
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@ -119,7 +119,38 @@ of the volume type, as follows:
.. code-block:: ini
sio:provisioning_type = thin\thick
provisioning:type = thin\thick
The old specification: ``sio:provisioning_type`` is deprecated.
Oversubscription
----------------
Configure the oversubscription ratio by adding the following parameter
under the seperate section for ScaleIO:
.. code-block:: ini
sio_max_over_subscription_ratio = OVER_SUBSCRIPTION_RATIO
Or, by adding the following parameter under the default section:
.. code-block:: ini
max_over_subscription_ratio = OVER_SUBSCRIPTION_RATIO
.. note::
If both are specified, ScaleIO will consider only the first,
and if none are specified there will be no oversubscription.
Oversubscription is calculated by the Block Storage service
correctly only if the extra specification ``provisioning:type``
appears in the volume type regardless to the default provisioning type.
Maximum oversubscription value supported for ScaleIO is 10.0.
Default provisioning type
-------------------------
If provisioning type settings are not specified in the volume type,
the default value is set according to the ``san_thin_provision``