Create a Redundancy Group
A redundancy group is an abstract construct that includes and manages a collection of objects on both nodes of a chassis cluster. A redundancy group is primary on one node and backup on the other node at any given time. Each redundancy group fails over from one node to the other independent of other redundancy groups. When a redundancy group fails over, all its objects fail over together.
Three things determine the primacy of a redundancy group: the priority configured for the node, the node ID (in case of tied priorities, the node with the lowest node ID number takes precedence), and the order in which the node comes up. If a lower priority node comes up first, it assumes the primacy for a redundancy group (and stays as primary if preempt is not enabled). If preempt is added to a redundancy group configuration, the device with the higher priority in the group can initiate a failover to become primary.
To create a redundancy group:
- Click Resources > Devices.
The Devices page is displayed.
- Click the device-name from the Device Name column to open the Device Details page
and then click CONFIGURATION (tab) > Redundancy Group (tab).
The Redundancy Group page is displayed.
You can also access the Device Details page from the Site Management page (Resources > Site Management site-name > DEVICES (tab) >device-name).
- Click the + button to add a new redundancy
Alternatively, click Create Redundancy Group link on the Create RETH Interface page. See Create a RETH Interface for more details.
The Add Redundancy Group page is displayed.
- Complete the configuration settings according to the guidelines provided in Table 1.
- Click OK.
The redundancy group is listed on the Redundancy Group page.
Table 1: Fields on the Add Redundancy Group Page
Select a unique identifier for the redundancy group.
Node 0 Priority
Enter the priority value of the node 0. The eligible node with the highest priority is elected master.
Node 1 Priority
Enter the priority value of the node 1. The eligible node with the highest priority is elected master.
Enable preempt to allow the device with the higher priority in the group to initiate a failover to become primary.
Note: You cannot enable preemption for redundancy group 0.