To add instances and to configure the HA group:

1. On the left navigation pane, click and select High Availability.
2. Click Create. The High Availability wizard appears.
3. In the Group Name field, enter a unique name for the HA group, and then click Continue.
4. In the Add GigaVUE-FM Instance page, the details of the GigaVUE-FM instance from which the HA group is created is fetched automatically.
5. Enter the External IP Address and Third-Party Authentication details, if required. Click the save icon to save the configuration.
6. Click Add New Node to add the second and third GigaVUE-FM instances. Enter the following details.
Field Description

Status

Status of the GigaVUE-FM instance. Can be Active or Standby.

IP Address/DNS Name

IP address/DNS name of the GigaVUE-FM instance (s for communication between the GigaVUE-FMs and to configure the HA group)

External IP Address

External IP address of the GigaVUE-FM instance (for accessing the GigaVUE-FM HA from outside the internal network.)
Role Role of the GigaVUE-FM instance. Can be configured as either:
  • Active-eligible: provides resiliency and load distribution
  • Supporting instances: provides scalability and performance
Username GigaVUE-FM User Name
Password GigaVUE-FM GUI password
Third Party Authentication Third-party authentication URL
7. Click the Save Node icon to validate the details entered for the instances.

Once the first three instances are added to the HA group, the Continue button is enabled.

8. Use the Add New Node button to continue to add the GigaVUE-FM HA instances. When adding the instances, define the role of the instances either as:
  • Active-eligible
  • Supporting instances
9. Review the details of the GigaVUE-FM instances. Use the Back button to go back and change the details.
10. Click the Edit Node icon to edit the details of the GigaVUE-FM instances, if required.

After adding the instances to the HA group, click Submit. The HA group is configured and will be displayed as follows:

Click the ellipses on a GigaVUE-FM instance to perform the following tasks:

  • Edit: Edit the instance details.
  • Reboot:Reboot aGigaVUE-FMinstance.
  • Remove from group: Remove an instance from the HA group.

The HA page displays the following details:

Table 1:

Field

Description
Status and Reachability

Status of the GigaVUE-FM instances. Can be:

  • Active
  • Standby
  • Supporting

Reachability:

  • - indicates that the instances are reachable.
  • - indicates that the instances are unreachable.
IP Address/DNS Name IP address/DNS name of the GigaVUE-FM instances
Role

Role of the GigaVUE-FM instance. Can be configured as follows:

  • Active-eligible: provides resiliency and load distribution
  • Supporting instances: provides scalability and performance
Entity ID Entity ID of GigaVUE-FM. It is a unique alpha-numeric ID that must be configured for SSO authentication.
Host Name Host name of the GigaVUE-FM instance.
Application Status

Status of application services that are responsible for handling the user requests:

  • Up: Indicates service is ready to handle the user requests
  • Down: Indicates service is not ready to handle the user requests with one or more underlying services being down.
  • In Progress : A state that appears between up and down indicating that the services are initializing.
Software Version Software version of the GigaVUE-FM instance.
System Uptime Time since the instance is up and active.
Third Party Authentication URL Third party authentication URL required for SSO configuration.
Upgrade Status Upgrade status of GigaVUE-FM. This is displayed only when upgrade is triggered. Otherwise, this field is empty.

You can add instances to the HA group by clicking the Add New Node button, as required. You can also remove the instances from the HA group and reduce the size of the HA group as required. However, while removing the instances ensure to retain the quorum1 number of instances.

Note:  To scale components such as Fabric Health Analytics, topology visualization and to improve the performance of GigaVUE-FM by fully utilizing the resource available, it is recommended to configure three active eligible instances and additional supporting instances.

The following are the behavioral changes observed in the HA group with active, standby and supporting instances:

Task Scenario Behavior
Backup and Restore Operation

All active-eligible instances are up and few or all supporting instances are up.

Backup will happen in active instance. During restore, all active-eligible GigaVUE-FMs will be rebooted and will perform the restore operation.

Supporting instances will not participate in restore.

Few active-eligible instances are up (Quorum number of instances are up) Backup will happen in active instance. Restore will not be initiated in this case.
Upgrade Operation Few instances not being up (either active-eligible or supporting instances not up) Upgrade will not be initiated.
  Few supporting instances are removed from the HA group after formation of the group Upgrade will be initiated and the supporting instances present in HA group would be upgraded first followed by the active-eligible instances.
  All instances are up and running Upgrade will be initiated in active instance. Upgrade will be done in a rolling fashion starting with supporting instances and ending with the active-eligible instances.
System Configurations All instances are active-eligible All GigaVUE-FM's GUI will be accessible and user can configure the system through the same
  HA with active-eligible and few Supporting instances For supporting instances, GUI will not be available (as application service is shut down). An option is provided in the GUI to turn on the application service and its dependent service(s) and the status can be seen in HA page. You can then configure the system related configuration from the logged in GigaVUE-FM instance once the application status of the supporting instance is up.
Background processes    
-FM Service Distribution All GigaVUE-FMs are active-eligible instances. Services will be equally distributed/redistributed among the instances based on availability of the instances
  HA group with active-eligible instances and supporting instances. Services will be distributed/re-distributed only to active eligible instances
-Load Balancer All GigaVUE-FMs are active-eligible instances. All GigaVUE-FM API requests will be distributed to all instances in the HA group.
  With supporting instances. All GigaVUE-FM API requests will be distributed only to active-eligible instances.

Keep in mind the following recommendations and notes when working with the HA group.

GigaVUE-FM cannot support more than 7 active-eligible nodes (this is due to the underlying constraint in MongoDB).

    Shrinking the size of the HA group:

    • When reducing the size of a HA group that has both active-eligible and supporting instances, it is always recommended to remove the supporting instances first so that the active-eligible instances remain intact in the HA group. If active-eligible instances are removed first from the HA group, then the HA group will become unstable. This however depends on the number of active-eligible and supporting instances in the HA group. Consider a GigaVUE-FM HA group with 7 instances. The number of active and supporting instances in a HA group may be as follows:

      • HA group 1 With 3 active instances and 4 supporting instances The recommendation is specifically applicable for HA group 1 in which there are only 3 active eligible instances in the group. Removing the active-eligible instances may cause the HA group to become unstable.
      HA group 2 With 5 active instances and 2 supporting instances. The recommendation is not applicable for HA group 2 as removing the active-eligible instances will not impact the stability of the HA group.

       For a HA group to be stable, it must have a minimum of two active-eligible instances in the group.

    • When reducing the size of HA group from 7 instance to 5 instance or 3 instance, the quorum is re-computed and adjusted accordingly. This is to ensure that the HA group remains intact with the available set of instances.
    • When reducing the size of the HA cluster, during removal of an instance make sure to give time for the Elastic Search to rebalance and return to a complete (100%) healthy state before removing the next instance. If you remove the instances subsequently one after the other, the health state of the HA group will turn red as there will be no time for shard rebalancing amongst the available instances.
      Login to GigaVUE-FM CLI as a root user and execute the following command to check the ES cluster health:

      • curl -XGET "http://localhost:9200/_cluster/health?pretty"

Supporting GigaVUE-FM Instances:

  • When a supporting instance is added to the HA group, its system information will not be available immediately and will be available only after a minute.
  • When the HA group is upgraded, application services of the supporting instances will be turned on automatically for upgrade and once FM HA upgrade is completed it will be turned off automatically. Application services will be turned off automatically irrespective of the upgrade completion status, that is, either success or failure.

Notes:
  • For supporting instances, system information will be populated in to MongoDB as the Application Service is down by default (scheduler populates the system information every minute in to MongoDB). Hence any changes in the system hostname or GigaVUE-FM version will be reflected in the GUI only after a minute.
  • In case of suspended mode, MongoDB will go into write protected mode. Therefore, any system related updates performed in the supporting nodes will not be reflected in the GUI.
  • If the supporting instance is not reachable, all system related information that is populated in the GUI reflects the previous known values and not the latest values for Application Status, Up Time, and other system related information.
  • Whenever the application services are up and running, events will be logged in the Events page (with the severity level - Info)