Merge "Add spec for Cinder Nimblestorage backend"
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specs/yoga/approved/cinder-nimblestorage.rst
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Copyright 2022 Canonical Ltd.
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This work is licensed under a Creative Commons Attribution 3.0
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Unported License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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..
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=============================================
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Cinder subordinate charm cinder-nimblestorage
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=============================================
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Problem Description
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===================
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Cinder has a great number of drivers for different backends. Almost all
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currently available commercial storage arrays and many other software only
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solutions have a driver available, if not already in the upstream cinder
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project, as an installable package that enables cinder with the extra driver.
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Because of how many possibilities exist, a model was developed where a separate
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subordinate charm will be deployed to take care of the specifics of the driver
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and pass configuration to the main cinder charm over a relation so that cinder
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can write to its own configuration file.
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Proposed Change
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===============
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Instead of changing the cinder charm, this proposal aims to create a separate
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subordinate charm specific for the nimblestorage driver. This cinder
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installation would enable access to Nimblestorage devices. The following points
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are of condiderable importance for the development of this subordinate charm:
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* The new implementation should not conflict with current implementation. Both
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should co-exist, even in the same deployment if possible.
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* The new charm should implement all features currently existing in the cinder
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charm, regarding the nimblestorage functionality.
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Note that because the Nimblestorage driver is part of the cinder-common package, no
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additional packages need to be installed for this charm to work.
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This charm would be supported in the Ussuri release of Openstack and newer.
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Alternatives
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------------
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At the time of this writing, there exist no alternatives.
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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Gustavo Sanchez <gustavo.sanchez@canonical.com> - LP ID: gustavosr98
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Secondary assignee:
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Luciano Lo Giudice <luciano.logiudice@canonical.com> - LP ID: lmlogiudice
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Gerrit Topic
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------------
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Use Gerrit topic "charm-cinder-nimblestorage" for all patches related to this spec.
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.. code-block:: bash
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git-review -t charm-cinder-nimblestorage
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Work Items
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----------
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The charm, as listed above. Plus, both unit and functional tests will be
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written.
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Repositories
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------------
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Presently, the following repository hosts the charm code:
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https://opendev.org/openstack/charm-cinder-nimblestorage
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Documentation
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-------------
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Once this charm is completed, charm-guide will be updated to reference it.
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Security
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--------
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No security aspect is going to change in relation to the current solution.
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Testing
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-------
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Code changes will be covered by both unit and functional tests.
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Functional tests would require Nimblestorage hardware.
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Dependencies
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============
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No dependencies in addition to the ones that exist in the current solution.
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