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

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Added documentation regarding ScaleIO over subscription and
thin provisioning capabilities.

Change-Id: I2a843bf123b5443874bdaa62503b21ef52098d99
This commit is contained in:
Matan Sabag 2016-09-02 10:15:43 -07:00
parent a5bf8d31a1
commit 5649f5ab22
1 changed files with 32 additions and 1 deletions
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33
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``