Multi-Master cluster configuration status

The Multi-Master section on the Welcome page of the IBM® Security Guardium® Key Lifecycle Manager graphical user interface displays the configuration status of the Multi-Master cluster. You can determine whether the cluster configuration in any of the master servers of the cluster is out of sync.

If the cluster configuration is out of sync, you can sync it from the graphical user interface. For more information, see Synchronizing Multi-Master cluster configuration.

Supported master server operations

Adding or removing a standby or non-HADR master server depends on the configuration status of the Multi-Master cluster. The following tables provide details of the operations. Each row provides information about whether you can add or remove a standby and non-HADR master server given a specific cluster status. For example, the first row in the Operation - Add master server table indicates that if the primary master server of the cluster is offline, you cannot add any type of master server to the cluster.
Note: The support for adding a non-HADR master server to a Multi-Master cluster will be deprecated in the later versions of IBM Security Guardium Key Lifecycle Manager. It is recommended to add a HADR master server to a Multi-Master cluster.
Table 1. Operation - Add master server
Cluster status Add master server of type
Standby Non-HADR
Primary master server is offline. No No
One or more standby master servers are offline. No Yes
Non-HADR master server is offline. Yes Yes
Cluster configuration on the standby master server is out of sync.

No

To add a standby master server, sync the master server that is out of sync and retry the operation.

 Yes
Table 2. Operation - Remove master server
Cluster status Remove master server of type
Standby Non-HADR
Primary master server is offline. No No
One or more standby master servers are offline.
  • An online standby master server: You cannot remove this standby master server.
  • A offline standby master server:
    • If more than one standby master servers are offline, you can remove all except one offline master server. A cluster must have at least one standby master server.
    • If the standby master server is the only master server other than the primary master server in the cluster, you can remove it. This scenario is a "Cluster-break" scenario. The primary and standby master servers will now act as standalone servers.
    • If the cluster has an offline standby master server and a non-HADR master server, you cannot remove the offline standby master server.

      To remove the offline Standby master server (cluster-break scenario), first remove all the non-HADR master servers, and then remove the offline standby master server.

 Yes
Non-HADR master server is offline. Yes Yes
Cluster configuration on the standby master server is out of sync. No

To remove a standby master server, sync the master server that is out of sync and retry the operation.

 Yes