Sap high availability installation guide

You need to deploy the internal load balancer in the resource group that contains the cluster nodes. Then, configure all necessary port forwarding rules with the probe ports of the internal load balancer. The clients can connect via the virtual host name. The DNS server resolves the cluster IP address, and the internal load balancer handles port forwarding to the active node of the cluster.

To achieve SAP application high availability, such as for SAP software components, you need to protect the following components:. You usually don't need a specific high-availability solution for the SAP Application Server and dialog instances. You achieve high availability by redundancy, and you'll configure multiple dialog instances in different instances of Azure Virtual Machines. An Azure availability set ensures that:. Learn more about how to manage the availability of virtual machines.

Because the Azure storage account is a potential single point of failure, it's important to have at least two Azure storage accounts, in which at least two virtual machines are distributed. In an ideal setup, the disks of each virtual machine that is running an SAP dialog instance would be deployed in a different storage account.

We discuss this in more detail later in the article. You need to protect it by using a high-availability solution. In this case, you don't need cluster shared disks, which simplifies the entire setup. This scenario is set up as follows:. The three-tier templates in Azure Resource Manager also support high-availability scenarios, such as in Architectural Template 1, which has two clusters. Here's where you can get Azure Resource Manager templates for the example scenario we describe in this article:.

All IP addresses of the network cards and Azure internal load balancers are dynamic by default. Change them to static IP addresses. We describe how to do this later in the article. You can use your Azure Virtual Network instance. The virtual network and subnet have already been created and prepared.

You can deploy your high-availability SAP system in a cloud-only deployment model. This kind of deployment primarily is useful for demo and test use cases. It's not suited for production use cases. The template doesn't create these virtual machines. To create a new multi-SID cluster, you need to deploy the following three templates:.

The following sections have more details about the templates and the parameters you need to provide in the templates. The following list contains all load balancing rules where x is the number of the SAP system, for example, 1, 2, The load balancer is configured to use the following probe ports where x is the number of the SAP system, for example, 1, 2, The database template deploys one or two virtual machines that you can use to install the relational database management system RDBMS for one SAP system.

To set up the database multi-SID template, in the database multi-SID template , enter values for the following parameters:. To set up the application servers multi-SID template, in the application servers multi-SID template , enter values for the following parameters:. In our example, the address space of the Azure virtual network is There is one subnet called Subnet , with an address range of All virtual machines and internal load balancers are deployed in this virtual network.

Don't make any changes to the network settings inside the guest operating system. Configure all your network settings in Azure. Select your settings based on the type of network you have. For more information, see the following resources:. When you create the cluster, create the virtual host names pr1-ascs-vir and pr1-dbms-vir and the associated IP addresses that manage the cluster itself. For information about how to do this, see Collect cluster nodes in a cluster configuration. You can manually create the other two virtual host names, pr1-ascs-sap and pr1-dbms-sap , and the associated IP addresses, on the DNS server.

After you deploy the virtual machines to use in your cluster, you need to set static IP addresses for all virtual machines. Do this in the Azure Virtual Network configuration, and not in the guest operating system. On the IP addresses blade, under Assignment , select Static. In the IP address box, enter the IP address that you want to use. If you change the IP address of the network card, you need to restart the Azure virtual machines to apply the change. Figure Set static IP addresses for the network card of each virtual machine.

The initial deployment sets the internal load balancer IP address to Dynamic. For example, if you want to change the default ASCS instance number from 00 to 31, you need to make the changes for all ports listed in Table 1. After you assign a static IP address to the virtual machines, add the virtual machines to the domain. Azure Load Balancer has an internal load balancer that closes connections when the connections are idle for a set period of time an idle timeout.

These connections usually remain established until the work process or the enqueue process restarts. However, if the connection is idle for a set period of time, the Azure internal load balancer closes the connections.

This isn't a problem because the SAP work process reestablishes the connection to the enqueue process if it no longer exists. These activities are documented in the developer traces of SAP processes, but they create a large amount of extra content in those traces. Set up the failover cluster by using Failover Cluster Manager. Do not add the second node yet; you'll add the second node in a later step. Figure Add the server or virtual machine name of the first cluster node.

You can ignore any warnings about disks at this point in the process. You'll add a file share witness and the SIOS shared disks later. At this stage, you don't need to worry about having a quorum. Change the IP address of the core cluster service. The cluster can't start until you change the IP address of the core cluster service, because the IP address of the server points to one of the virtual machine nodes.

Do this on the Properties page of the core cluster service's IP resource. For example, we need to assign an IP address in our example, Figure In the Properties dialog box, change the IP address. Figure Cluster core service is up and running, and with the correct IP address. Be sure that the Add all eligible storage to the cluster check box is NOT selected. You can ignore warnings about quorum and disks.

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There are no dependencies on Azure. Restart cluster node A within the Windows guest operating system. Restart cluster node A from the Azure portal. Restart cluster node A by using Azure PowerShell.

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Please rate your experience Yes No. Any additional feedback? Important Keep in mind that the configuration in the Azure internal load balancer load balancing rules if using Basic SKU and the selected SAP instance numbers must match.