is deployed on local disks on each of the clustered nodes, therefore there is no need for shared disk.needs the IP address of ERS virtual hostname to be configured on Azure Internal Load Balancer, in addition to the (A)SCS IP address.uses dedicated virtual/network host name.Shared disk is also supported with Enqueue server replication 2 architecture, where the Enqueue Replication Server 2 (ERS2) instance: is deployed on local disks on each of the cluster nodes.Shared disk is supported with Enqueue server replication 1 architecture, where Enqueue Replication Server (ERS) instance: SAP ASCS/SCS HA architecture with shared disk Shared Disk and Enqueue Replication Server There is separate to access the enqueue server process.The same is used to access the SAP message server process, and the SAP global host files via the sapmnt file share.With Enqueue server replication 2 architecture: The same cluster shared disk drive S is shared between them.The same is used to access the SAP message and enqueue server processes, and the SAP global host files via the sapmnt file share.With Enqueue server replication 1 architecture: SAP ASCS/SCS HA architecture with shared disk We use clustered shared disks (drive S, in our example), to place the SAP ASCS/SCS and SAP global host files. In a high-availability setting, you cluster SAP ASCS/SCS instances. ![]() Processes, file structure, and global host sapmnt file share of an SAP ASCS/SCS instance The sapmnt file share, which enables access to these global S:\usr\sap\\SYS. Two processes, a message and enqueue server, and an, which is used to access these two processes.SAP global host files store central files for the entire SAP system.Īn SAP ASCS/SCS instance has the following components: In Windows, an SAP ASCS/SCS instance contains SAP central services, the SAP message server, enqueue server processes, and SAP global host files. Windows Server failover clustering configuration in Azure without a shared disk SAP ASCS/SCS HA with cluster shared disks If you need additional IP address for the VM, deploy a second NIC. For details see Azure Load balancer Limitations. The DNS server resolves the cluster IP address, and the internal load balancer handles port forwarding to the active node of the cluster.įloating IP is not supported on a NIC secondary IP configuration in load-balancing scenarios. Clients can connect via the virtual host name. Then, configure all necessary port forwarding rules by using the probe ports of the internal load balancer. ![]() With the internal load balancer, clients reach the cluster over the cluster virtual IP address.ĭeploy the internal load balancer in the resource group that contains the cluster nodes. The Azure Load Balancer service provides an internal load balancer for Azure. You need an alternative solution to set up a virtual IP address to reach the cluster resource in the cloud. The Azure cloud platform doesn't offer the option to configure virtual IP addresses, such as floating IP addresses. Name resolution in Azure and the cluster virtual host name When you build a cluster, you need to set several IP addresses and virtual host names for the SAP ASCS/SCS instance. Windows Server failover clustering with Azure Virtual Machines requires additional configuration steps. Windows Server failover clustering in Azure
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