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[escalator.git] / doc / 06-Information_Flows.rst

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-Information Flows
------------------
-
-This section describes the information flows among the function
-entities when Escalator is in actions.
-
-1. Upgrade process of Compute nodes
-
-1.1 consider VIM as a whole
-
-.. figure:: images/figure4.png
-   :name: figure4
-   :width: 100%
-
-process is:
-1. Operators add new version files on the VIM,initiate the upgrade.
-2. VIM chooses some compute nodes as the upgrade target nodes, and set them
-into maintenance mode. VIM queries the list of running VMs on target nodes.
-3. VIM notice VNFM corresponding to  the virtual machine, to migrate the
-business.
-4. VNFM migrates the business. If the business is in active of active-standby
-mode, it will initiate switch-over. If the business is in loading balance mode,
-it will move the business to other node.
-5. After VNFM moves business, it notifies the VIM.
-6. VIM judges whether the business on the target VM has all been moved. If
-not, VIM migrates the VM with business loaded to other free nodes. Then VIM
-upgrades the target computer nodes. After upgrade, VIM set the target compute
-nodes into normal nodes.
-7. If there are computer nodes remained to be upgraded, goto step 2.
-
-4.2 from inside VIM
-
-.. figure:: images/figure5.png
-   :name: figure5
-   :width: 100%
-
-.. figure:: images/figure6.png
-   :name: figure6
-   :width: 100%
-
-process is:
-1. Upgrade manager receives user operation commands. Add new version files.
-Upgrade is began.
-2. Upgrade Manager selects compute node A to Upgrade. Query list of the VMs
-running the compute nodes A to the Cloud Manager, and set the node to
-maintenance mode, that is to say creation or migration of new VM on this node
-is impossible anymore.
-3. Upgrade Manager notifies VNFM compute node A  into maintenance mode by VIM
-interface, temporarily disabling the inserting of business, and business on
-compute node A need move to the other available compute nodes.
-4. When receives the VNFM reply, or waited for a timeout, Upgrade Manager
-notifies the system support on compute node A to do software upgrade.
-5. After upgraded, Upgrade Manager removes maintenance mode for the compute
-node A.
-6. Upgrade Manager claims VNFM computing nodes A available.
-7. Select computer node B to upgrade
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