:status: new

==============================================
System upgrade (3.0.2 onwards) - system nodes
==============================================

.. important::
   Before committing to the upgrade process, administrators should take appropriate measures: create a backup or at least snapshot of NV3 primary node; schedule service window for the update; allow access from NV3 nodes to the *cloud.nacview.com* and *repo.nacview.com* domain on standard HTTPS protocol (TCP/443).

.. important::
    Prerequisites for update are as follows:
    - active support subscription on the partner portal
    - NV3's serial number is registered on the partner portal

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Performing the upgrade
------------------------

1. Login to the NACVIEW NV3 Web UI and proceed to the `System configuration`, then `System nodes`. Click on `Upgrade` button to bring out upgrade window. 

.. thumbnail:: /_images/getting-started/upgrade/upgrade-web-1.jpg
    :width: 50 %

2. Click on the `Slave` tab to change to secondary node's update wizard. Select the nodes you want to update. 

.. thumbnail:: /_images/getting-started/upgrade/upgrade-web-2.jpg
    :width: 50 %

.. thumbnail:: /_images/getting-started/upgrade/upgrade-web-2.jpg
    :width: 50 %

3. Click on `Upgrade` button to begin update process. A notification will appear, confirming that update job was scheduled.

.. thumbnail:: /_images/getting-started/upgrade/upgrade-web-2.jpg
    :width: 50 %

The progress can be monitored by means of notifications (upper right-hand corner of the page) and the `Version` field on the list of nodes.

.. warning::
   In case of encountering errors when trying to login to the system's Web UI, one should clear system cache. Login to the CLI and select `2. Maintenance`, then select `9. Clear system cache`.

.. thumbnail:: /_images/getting-started/upgrade/upgrade-web-7.jpg
    :width: 50 %
