To have SAP application servers connect to primary database, you need a virtual host name and a virtual IP address. In the event of a failover, the SAP application servers will connect to new primary database instance. Complete the planning process before you execute the deployment. Make a list of all host names, including virtual host names, and update your DNS servers to enable proper IP address to host-name resolution. If a DNS server doesn't exist or you can't update and create DNS entries, you need to use the local host files of the individual VMs that are participating in this scenario.
If you're using host files entries, make sure that the entries are applied to all VMs in the SAP system environment. However, we recommend that you use your DNS that, ideally, extends into Azure. We highly recommend a minimum of Red Hat Enterprise Linux 7. Write down the "Database Communication port" that's set during installation. It must be the same port number for both database instances.
It is mandatory that you test for proper functionality of failover and takeover with these parameter settings. Because individual configurations can vary, the parameters might require adjustment.
Specific to IBM Db2 with HADR configuration with normal startup: The secondary or standby database instance must be up and running before you can start the primary database instance. To set up the Standby database server by using the SAP homogeneous system copy procedure, execute these steps:. For details see Azure Load balancer Limitations. Select the availability set or the virtual machines hosting IBM Db2 database created in the preceding step.
Select TCP as the protocol and port Keep the Interval value set to 5 , and keep the Unhealthy threshold value set to 2. Select the front-end IP address, the back-end pool, and the health probe that you created earlier for example, Db2-frontend. When you use Pacemaker for automatic failover in the event of a node failure, you need to configure your Db2 instances and Pacemaker accordingly.
This section describes this type of configuration. It's not important which node the resources are running on. You must manage the Pacemaker clustered Db2 instance by using Pacemaker tools. Issue the lsrpdomain command as a root user to see if your cluster is online:.
Issue the following preprpnode commands as a root user to allow communication between the existing nodes and the new node. Make sure that you execute the preprpnode command on each node. It is strongly recommended. In order to add Node3 to the cluster definition, issue the addrpnode command as a root user on Node1 or Node2, which are already online on the cluster:. I would like to acknowledge Priti Desai, Database Consultant, IBM Silicon Valley Lab, for her valuable input and for proofreading, which greatly helped in bringing this article to successful completion.
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Tags for this article: nodes , tsa-hadr Tag this! Update My dW interests Log in What's this? Skip to help for Update My dW interests. This mode provides the greatest protection against transaction loss, but at a cost of higher transaction response time. This mode provides somewhat less protection against transaction loss, in exchange for a shorter transaction response time than that of SYNC mode.
Loss of data occurs only if both sites fail simultaneously and if the standby site has not transferred to nonvolatile storage all the log data that it received. The database is waiting to connect to its partner to do remote catchup. The primary and standby databases are connected and are in peer state. Email Address. Leave a Comment. Thank you for your feedback for Topic Request. Your Request will be reviewed by our technical reviewer team and, if approved, will be added as a Topic in our Knowledgebase.
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