expose quiesce unquiesce api

Registered by Chaoyi Huang on 2015-09-06

Currently the Nova provide VM snapshot API, which will take a consistency snapshot of a VM and regarding volumes, and will quiesce/unquiesce VM automatily with guest agent support.

In NFV scenario, a VNF (telecom application) often is consisted of a group of VMs. To make it be able to restore in another site for catastrophic failures happened, this group of VMs snapshot/backup/restore should be done in a transaction way to guarantee the application level consistency but not only on single VM level : for example, quiesce VM1, quiesce VM2, quiesce VM3, snapshot VM1's volumes, snapshot VM2's volumes, snapshot VM3's volumes, unquiesce VM3, unquiesce VM2, unquiesce VM1. For some telecom application, the order is very important for a group of VMs with strong relationship.

Provide atomic quiesce / unquiesce API from Nova, to make consistency snapshot of a group of VMs in a transaction way is possible.

Refer to https://gerrit.opnfv.org/gerrit/#/c/1438/3/multisite-vnf-gr-requirement.rst for more detail description.
Minutes of OPNFV multisite project meeting: http://ircbot.wl.linuxfoundation.org/meetings/opnfv-meeting/2015/opnfv-meeting.2015-09-03-08.02.html

Blueprint information

Status:
Started
Approver:
John Garbutt
Priority:
Low
Drafter:
Chaoyi Huang
Direction:
Needs approval
Assignee:
Chaoyi Huang
Definition:
Pending Approval
Series goal:
None
Implementation:
Needs Code Review
Milestone target:
None
Started by
Chaoyi Huang on 2015-11-25

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Gerrit topic: https://review.openstack.org/#q,topic:bp/expose-quiesce-unquiesce-api,n,z

Addressed by: https://review.openstack.org/248989
    Expose quiesce/unquiesce API

Sorry, we have now hit the Non-Priority Feature Freeze for Mitaka. For more details please see: http://docs.openstack.org/releases/schedules/mitaka.html#m-nova-npff and http://docs.openstack.org/developer/nova/process.html#non-priority-feature-freeze
--johnthetubaguy 2016.02.03

Addressed by: https://review.openstack.org/295595
    Expose quiesce/unquiesce API

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