nova-specs/specs/newton/implemented/libvirt-vzstorage-volume-support.rst

Libvirt: Support for attaching volumes located on Virtuozzo Storage

https://blueprints.launchpad.net/nova/+spec/libvirt-vzstorage-volume-support

The purpose of this blueprint is to add an ability to use volumes hosted by Virtuozzo Storage¹ previously implemented as one of Cinder Drivers².

Problem description

Virtuozzo Storage is a fault-tolerant distributed storage system. From client's point of view it is a remote file system storage similar to NFS, GlusterFS or CIFS.

Virtuozzo Storage allows to use disk space of conventional linux systems to provide fault-tolerant storage with automatic recovery. It's optimized for performance of virtualization workloads and has strong data consistency.

Use Cases

A user is able to attach block storage exported in the form of virtual disks resided on Virtuozzo Storage to Nova instances.

Proposed change

A new volume driver is added in order to support attaching volumes resided on Virtuozzo Storage. This volume driver has a similar workflow to what NFS and SMBFS volume drivers have.

The CI system³ runs on Nova tree and checks each Nova patch with Virtozzo Storage and leaves a comment about status of tempest run.

Alternatives

None

Data model impact

None

REST API impact

None

Security impact

The share credentials will be parsed in the volume connection info and used when mounting a Virtuozzo Storage cluster.

Notifications impact

None

Other end user impact

None

Performance Impact

None

Other deployer impact

The deployer will be able to configure the path where the Virtuoozo Storage clusters will be mounted, as well as setting mount flags.

Developer impact

None

Implementation

Assignee(s)

Primary assignee:

eantyshev

Other contributors:

mnestratov, dguryanov

Work Items

Spec approval. Implementation:⁴ Documentaiton.

Dependencies

Remotefs os-brick part merged in review⁵ Cinder part implementation merged in review⁶

Testing

This feature should be tested in conjunction with the Virtuozzo Storage Cinder Volume driver. The existing Tempest tests along with the related unit tests should be enough.

A third party CI testing system is up and running⁷

Documentation Impact

Using the Virtuozzo Storage backend should be documented.

References

History

Revisions

Release Name	Description
Mitaka	Approved.
Newton	Re-introduced.

---

1. https://virtuozzo.com/wp-content/uploads/2016/03/Virtuozzo_Virtuozzo_Storage_DS_A4_EN_20160305.pdf↩︎

2. https://blueprints.launchpad.net/cinder/+spec/virtuozzo-cloud-storage-support↩︎

3. https://wiki.openstack.org/wiki/ThirdPartySystems/Virtuozzo_Storage_CI↩︎

4. https://review.openstack.org/#/c/190843/↩︎

5. https://review.openstack.org/#/c/188805/↩︎

6. https://review.openstack.org/#/c/188869/↩︎

7. https://wiki.openstack.org/wiki/ThirdPartySystems/Virtuozzo_Storage_CI↩︎