94 lines
3.1 KiB
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94 lines
3.1 KiB
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=======================
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Coho Data volume driver
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=======================
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The Coho DataStream Scale-Out Storage allows your Block Storage service to
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scale seamlessly. The architecture consists of commodity storage servers
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with SDN ToR switches. Leveraging an SDN OpenFlow controller allows you
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to scale storage horizontally, while avoiding storage and network bottlenecks
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by intelligent load-balancing and parallelized workloads. High-performance
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PCIe NVMe flash, paired with traditional hard disk drives (HDD) or solid-state
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drives (SSD), delivers low-latency performance even with highly mixed workloads
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in large scale environment.
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Coho Data's storage features include real-time instance level
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granularity performance and capacity reporting via API or UI, and
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single-IP storage endpoint access.
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Supported operations
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~~~~~~~~~~~~~~~~~~~~
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* Create, delete, attach, detach, retype, clone, and extend volumes.
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* Create, list, and delete volume snapshots.
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* Create a volume from a snapshot.
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* Copy a volume to an image.
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* Copy an image to a volume.
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* Create a thin provisioned volume.
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* Get volume statistics.
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Coho Data QoS support
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~~~~~~~~~~~~~~~~~~~~~
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QoS support for the Coho Data driver includes the ability to set the
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following capabilities in the OpenStack Block Storage API
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``cinder.api.contrib.qos_specs_manage`` QoS specs extension module:
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* **maxIOPS** - The maximum number of IOPS allowed for this volume.
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* **maxMBS** - The maximum throughput allowed for this volume.
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The QoS keys above must be created and associated with a volume type.
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For information about how to set the key-value pairs and associate
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them with a volume type, see the `volume qos
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<http://docs.openstack.org/developer/python-openstackclient/command-objects/volume-qos.html>`_
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section in the OpenStackClient command list.
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.. note::
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If you change a volume type with QoS to a new volume type
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without QoS, the QoS configuration settings will be removed.
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System requirements
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~~~~~~~~~~~~~~~~~~~
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* NFS client on the Block storage controller.
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Coho Data Block Storage driver configuration
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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#. Create cinder volume type.
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.. code-block:: console
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$ openstack volume type create coho-1
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#. Edit the OpenStack Block Storage service configuration file.
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The following sample, ``/etc/cinder/cinder.conf``, configuration lists the
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relevant settings for a typical Block Storage service using a single
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Coho Data storage:
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.. code-block:: ini
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[DEFAULT]
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enabled_backends = coho-1
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default_volume_type = coho-1
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[coho-1]
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volume_driver = cinder.volume.drivers.coho.CohoDriver
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volume_backend_name = coho-1
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nfs_shares_config = /etc/cinder/coho_shares
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nas_secure_file_operations = 'false'
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#. Add your list of Coho Datastream NFS addresses to the file you specified
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with the ``nfs_shares_config`` option. For example, if the value of this
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option was set to ``/etc/cinder/coho_shares``, then:
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.. code-block:: console
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$ cat /etc/cinder/coho_shares
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<coho-nfs-ip>:/<export-path>
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#. Restart the ``cinder-volume`` service to enable Coho Data driver.
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.. include:: ../../tables/cinder-coho.rst
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