Network Deployment (Distributed operating systems), v8.0 > Establishing high availability
Select the policy for a high availability group
Every high availability group has an associated policy. The high availability manager uses this policy to determine which members of a high availability group to put in the active state. Before you select a policy for a high availability group, you should review the following topics:
You should also know:
You have multiple policies defined for a high availability group, and to specify which of these policies the high availability manager uses to govern the group.
- The name of the core group to associate with the new policy.
- The name of the high availability group that you want this policy to control.
- The function, such as transaction log recovery or messaging engine, that is associated with this high availability group.
- The policy types, such as One of N or Static, that this function supports.
- The type of policy to create.
- The policy settings, such as failback, and preferred servers only, to configure for this policy.
To select a policy for a high availability group:
- In the admin console, click...
Servers > Core Groups > Core group settings > core_group_name.
- Click the Runtime tab to determine both the name of the high availability group, and the name of the policy that is currently controlling the group. See View high availability group information for more information on how to perform this step. We must have at least one of the group members running.
- Click the Configuration tab to determine the match criteria defined in the current high availability group policy.
- Use the information you obtained in the previous steps and update the match criteria for the policy you are selecting. The match criterion must contain all of the match criteria from the original policy, and at least one additional attribute from the name of the high availability group.
- Click OK and then click Review.
- Select Synchronize changes with nodes, and then click Save.
ResultsThe high availability manager uses the new policy to govern the designated high availability groups.
High availability groups
Set up a high availability environment
New core group policy definition