Set high availability policy

 

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Overview

Every high availability group requires an associated policy that determines which members to put in the active state.

If the default policies are inadequate, create a new policy instead of changing the default. The creation of new policies provides you with the capability to tailor the policy settings to the installations requirements while giving you the option to revert back to the default policy.

Create a new high availability policy

1. Go to...

   Servers | Core Groups | Core group settings | core_group_name | Policies | New

2. Select a policy...

   All active policy	All of the group members are activated.
   M of N policy	M group members are activated.
   No operation policy	No group members are activated.
   One of N policy	Only one group member is activated.
   Static policy	The active members of a group are statically configured.

3. Click Next.

4. Specify a name and description

5. To set frequency of health checks, set value for "Is alive"

   -1	Is alive timer is disabled.
   0	Default. Value specified for the Is alive timer at the core group services level is used for HA groups associated with this policy.
   1 - 2147483647	Inclusive value used for the HA groups associated with this policy.

6. Make sure Quorum is not selected.

   You should not enable Quorum unless we are explicitly instructed to do so in the documentation for some other product.

7. To have the HA manager make the most preferred member the currently active member, select...

   Failback

   This option is available only for M of N and One of N policies.

8. To only activate group members on servers contained in the Preferred servers list, select...

   Preferred servers only

   Available only for M of N and One of N policies. If selected, configure a list of preferred servers.

9. Set number of group members to make active...

   Number of active members

   This option is available only for an M of N policy.

10. To configure the match criteria for this policy, click...

    Apply | Match criteria | New

    ...and set...

    Name	Name of one of the name-value pairs contained in the name of the HA group to associate with this policy.
    Value	Value of the name-value pair specified in Name.
    Description

    Repeat these steps for each additional attribute you want to include as part of the match criterion.

11. To statically configure the list of servers to be activated.

    Additional Properties | Static group servers

    This option is available only for Static policies.

    Click Add to move core group servers into the list of Static group servers, and then Click OK after you complete the list.

12. Select the preferred servers for this policy...

    Additional Properties | Preferred servers

    This option is available only if we selected Preferred serversonly for M of N and One of > policies. If we do not set up this list, no group members are activated.

    Click Add to move core group servers into the list of preferred servers.

    Click Move up and Move down to adjust the order of the servers.

    Set the most preferred server is at the beginning of the list and the least preferred server is at the end of the list.

    Use caution when selecting preferred servers. WAS ND v7.0 cannot detect if we select an inappropriate server as a preferred server.

    For example, if the policy affects a messaging engine or transaction service, only select preferred servers from the messaging engine cluster.

    Similarly, if the policy affects a transaction service, only select preferred servers from the transaction service cluster.

13. Save and sync...

    OK | Review | Synchronize changes with nodes | Save

The new policy goes into affect after it is saved and synchronized. You do not have to stop and restart the affected appservers.

 

Related

High availability manager
Core group policies
Core group policy settings
New core group policy definition
Preferred servers
Match criteria collection
Match criteria settings
Static group servers collection
Select the policy for a HA group
Set up a HA environment