81 lines
2.5 KiB
ReStructuredText
81 lines
2.5 KiB
ReStructuredText
===============================
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Basic volume quality of service
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===============================
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Basic volume QoS allows you to define hard performance limits for volumes
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on a per-volume basis.
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Performance parameters for attached volumes are controlled using volume types
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and associated extra-specs.
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As of the 13.0.0 Rocky release, Cinder supports the following options to
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control volume quality of service, the values of which should be fairly
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self-explanatory:
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* `read_iops_sec`
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* `write_iops_sec`
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* `total_iops_sec`
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* `read_bytes_sec`
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* `write_bytes_sec`
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* `total_bytes_sec`
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* `read_iops_sec_max`
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* `write_iops_sec_max`
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* `total_iops_sec_max`
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* `read_bytes_sec_max`
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* `write_bytes_sec_max`
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* `total_bytes_sec_max`
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* `size_iops_sec`
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Note that the `total_*` and `total_*_max` options for both iops and bytes
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cannot be used with the equivalent `read` and `write` values.
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For example, in order to create a QoS extra-spec with 20000 read IOPs and
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10000 write IOPs, you might use the Cinder client in the following way:
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.. code-block:: console
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$ cinder qos-create high-iops consumer="front-end" \
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read_iops_sec=20000 write_iops_sec=10000
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+----------+--------------------------------------+
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| Property | Value |
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+----------+--------------------------------------+
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| consumer | front-end |
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| id | f448f61c-4238-4eef-a93a-2024253b8f75 |
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| name | high-iops |
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| specs | read_iops_sec : 20000 |
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| | write_iops_sec : 10000 |
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+----------+--------------------------------------+
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The equivalent OpenStack client command would be:
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.. code-block:: console
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$ openstack volume qos create --consumer "front-end" \
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--property "read_iops_sec=20000" \
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--property "write_iops_sec=10000" \
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high-iops
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Once this is done, you can associate this QoS with a volume type by using
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the `qos-associate` Cinder client command.
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.. code-block:: console
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$ cinder qos-associate QOS_ID VOLUME_TYPE_ID
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or using the `openstack volume qos associate` OpenStack client command.
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.. code-block:: console
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$ openstack volume qos associate QOS_ID VOLUME_TYPE_ID
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You can now create a new volume and attempt to attach it to a consumer such
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as Nova. If you login to the Nova compute host, you'll be able to see the
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assigned limits when checking the XML definition of the virtual machine
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with `virsh dumpxml`.
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.. note::
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As of the Nova 18.0.0 Rocky release, front end QoS settings are only
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supported when using the libvirt driver.
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