Add the StorPool volume attach/detach proposal.
Change-Id: I38960514e4cd914cb8acc3a2250c213b1d485e17
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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==========================================
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StorPool Volume Attachment
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==========================================
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https://blueprints.launchpad.net/nova/+spec/libvirt-storpool-volume-attach
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There are various Nova volume drivers providing access to Cinder volumes using
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specific types of storage, such as LVM, RBD, etc. The purpose of this
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blueprint is to add a driver supporting the volumes defined in a StorPool
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cluster.
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Problem description
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===================
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StorPool is distributed data storage software running on standard x86 servers.
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StorPool aggregates the performance and capacity of all drives into a shared
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pool of storage distributed among the servers. Within this storage pool the
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user creates thin-provisioned volumes that are exposed to the clients as block
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devices. StorPool consists of two parts wrapped in one package - a server and
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a client. The StorPool server allows a hypervisor to act as a storage node,
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while the StorPool client allows a hypervisor node to access the storage pool
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and act as a compute node. In OpenStack terms the StorPool solution allows
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each hypervisor node to be both a storage and a compute node simultaneously.
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Use Cases
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---------
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As a Deployer, I want to be able to attach StorPool volumes managed by Cinder
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to my instances for persistent storage, taking advantage of StorPool's
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performance and scalability during the instance operation, instant attachment
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of the volume to the hypervisor at instance startup, and seamless migration of
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the instance to a different hypervisor.
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Project Priority
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----------------
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None.
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Proposed change
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===============
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The proposed driver will make use of the StorPool API (based on JSON over HTTP)
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to attach and detach volumes defined in the StorPool cluster and already known
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to Cinder.
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Alternatives
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------------
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None.
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Data model impact
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-----------------
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None.
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REST API impact
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---------------
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None.
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Security impact
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---------------
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None.
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Notifications impact
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--------------------
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None.
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Other end user impact
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---------------------
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None.
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Performance Impact
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------------------
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The requests to attach or detach a volume will be passed on to the StorPool
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JSON-over-HTTP API.
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Other deployer impact
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---------------------
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None.
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Developer impact
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----------------
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None.
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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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Peter Penchev <openstack-dev@storpool.com>
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Other contributors:
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None
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Work Items
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----------
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* Write the nova.virt.libvirt.storpool driver to attach and detach volumes.
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* Write tests for the StorPool driver.
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* Provide a CI setup for the StorPool driver.
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Dependencies
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============
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The StorPool driver for Cinder for handling StorPool volumes:
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https://blueprints.launchpad.net/cinder/+spec/storpool-block-driver
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Testing
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=======
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Since the test setup requires an operational StorPool cluster, the unit tests
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will mostly use mocking to simulate the operations. A separate continuous
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integration environment will be set up by StorPool and access to it will be
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provided for running automated CI tests.
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Documentation Impact
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====================
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Using the StorPool driver will be documented.
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References
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==========
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The StorPool distributed storage software: http://storpool.com/
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