openstack/openstack-manuals
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Merge "Scaling QoS for ScaleIO driver"

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2016-09-23 14:02:21 +00:00
committed by Gerrit Code Review
parent 8f7577fad6 9bc2b493a1
commit ffe8679a67
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doc/config-reference/source/block-storage/drivers/emc-scaleio-driver.rst
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@@ -82,10 +82,14 @@ QoS support for the ScaleIO driver includes the ability to set the
following capabilities in the Block Storage API following capabilities in the Block Storage API
``cinder.api.contrib.qos_specs_manage`` QoS specs extension module: ``cinder.api.contrib.qos_specs_manage`` QoS specs extension module:
* ``minBWS`` * ``maxIOPS``
* ``maxIOPSperGB``
* ``maxBWS`` * ``maxBWS``
* ``maxBWSperGB``
The QoS keys above must be created and associated with a volume type. 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 For information about how to set the key-value pairs and associate
them with a volume type, run the following commands: them with a volume type, run the following commands:
@@ -98,13 +102,28 @@ them with a volume type, run the following commands:
$ cinder help qos-associate $ cinder help qos-associate
``maxBWS``
The QoS I/O issue bandwidth rate limit in KBs. If not set, the I/O issue
bandwidth rate has no limit. The setting must be a multiple of 1024.
``maxIOPS`` ``maxIOPS``
The QoS I/O issue bandwidth rate limit in MBs. If not set, the I/O issue The QoS I/O rate limit. If not set, the I/O rate will be unlimited.
bandwidth rate has no limit. The setting must be larger than 10. The setting must be larger than 10.
``maxIOPSperGB``
The QoS I/O rate limit.
The limit will be calculated by the specified value multiplied by
the volume size.
The setting must be larger than 10.
``maxBWS``
The QoS I/O bandwidth rate limit in KBs. If not set, the I/O
bandwidth rate will be unlimited. The setting must be a multiple of 1024.
``maxBWSperGB``
The QoS I/O bandwidth rate limit in KBs.
The limit will be calculated by the specified value multiplied by
the volume size.
The setting must be a multiple of 1024.
The driver always chooses the minimum between the QoS keys value
and the relevant calculated value of ``maxIOPSperGB`` or ``maxBWSperGB``.
Since the limits are per SDC, they will be applied after the volume Since the limits are per SDC, they will be applied after the volume
is attached to an instance, and thus to a compute node/SDC. is attached to an instance, and thus to a compute node/SDC.