Extending an SAP HANA Resource Hierarchy

!Important Note: Before extending your SAP HANA resource hierarchy, SAP HANA System Replication must be enabled and fully configured and the database must be running on all servers in the cluster. See Configure SAP HANA System Replication for details.

This operation can either be performed from the Edit menu or initiated automatically upon completing the Create Resource Hierarchy option, in which case you should begin with Step 2 below.

1. From the Edit menu, select Resource, then Extend Resource Hierarchy. The Pre-Extend Wizard appears. If you are unfamiliar with the Extend operation, click Next. If you are familiar with the LifeKeeper Extend Resource Hierarchy defaults and want to bypass the prompts for input/confirmation, click Accept Defaults.

2. Select the Template Server from which you want to extend an existing SAP HANA resource. (This dialog box will not appear if you selected the Extend task by right-clicking on a resource instance in the right pane.) Click Next.

3. Select the Tag to Extend for the SAP HANA resource that you would like to extend. (This dialog box will not appear if you selected the Extend task by right-clicking on a resource instance in either pane.) Click Next.

4. Select intelligent for the Switchback Type to be used for the SAP HANA resource. Click Next.

Intelligent Switchback means that after a failover to the backup server, an administrator must manually switch the SAP HANA resource back to the primary server. CAUTION: This release of LifeKeeper does not support Automatic Switchback for SAP HANA resources. Additionally, the Automatic Switchback restriction is applicable for any other LifeKeeper resource with a dependency on a SAP HANA resource.

5. Select or enter the Template Priority. Click Next.

This is the priority for the SAP HANA hierarchy on the server where it is currently in service. Any unused priority value from 1 to 999 is valid, where a lower number means a higher priority (1=highest). The extend process will reject any priority for this hierarchy that is already in use by another system. The default value is recommended. Note: This selection will appear only for the initial extend of the hierarchy.

6. Select or enter the Target Priority. Click Next.

This is a priority for the newly extended SAP HANA hierarchy relative to equivalent hierarchies on other servers. Any unused priority value from 1 to 999 is valid, indicating a server’s priority in the cascading failover sequence for the resource. Note that LifeKeeper assigns priority 1 to the server on which the hierarchy is created by default. The priorities need not be consecutive, but no two servers can have the same priority for a given resource.

7. After receiving the message that the pre-extend checks were successful, click Next.

8. The Extend Wizard will prompt you to enter the Root Tag for the SAP HANA resource. This is the unique name used by LifeKeeper to identify the equivalent SAP HANA resource being created on the target server. Note: The SAP HANA resource tag name is required to be the same across all cluster servers, so it cannot be edited in this dialog box.

9. Select whether to Enable or Disable Local Recovery for the SAP HANA resource on the chosen server. In some situations when using SAP HANA System Replication, especially when protecting a large database instance, after detection of a failure on the primary database host it may be faster to switch over to the running standby database instance rather than attempt to stop and restart the database on the current primary host. In order to disable all local recovery attempts for the SAP HANA resource on the chosen server, select Disable. Otherwise, select Enable.

10. (Only shown when extending to 3rd and 4th node) Select the replication mode between the node being extended to and the previous secondary node.

11. (Only shown when extending to 3rd and 4th node) Select the operation mode between the node being extended to and the previous secondary node.

12. Click Extend. The Extend Wizard will then extend your SAP HANA resource hierarchy to the target server. If a problem is detected, an error message will appear in the information box.

13. After receiving the message “Hierarchy successfully extended“, click Next Server to extend the hierarchy to another server, or click Finish if there are no other extend operations to perform.

14. After receiving the message “Hierarchy Verification Finished“, click Done.