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articles/sap/workloads/high-availability-guide-suse-multi-sid.md

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@@ -44,7 +44,7 @@ In the example configurations, installation commands etc. three SAP NetWeaver 7.
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* **NW3**: ASCS instance number **20** and virtual hostname **msnw3ascs**; ERS instance number **22** and virtual host name **msnw3ers**.
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The article doesn't cover the database layer and the deployment of the SAP NFS shares.
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In the examples in this article, we are using virtual names nw2-nfs for the NW2 NFS shares and nw3-nfs for the NW3 NFS shares, assuming that NFS cluster was deployed.
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In the examples in this article, we're using virtual names nw2-nfs for the NW2 NFS shares and nw3-nfs for the NW3 NFS shares, assuming that NFS cluster was deployed.
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Before you begin, refer to the following SAP Notes and papers first:
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> [!IMPORTANT]
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>
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> * Don't enable TCP time stamps on Azure VMs placed behind Azure Load Balancer. Enabling TCP timestamps will cause the health probes to fail. Set the `net.ipv4.tcp_timestamps` parameter to `0`. For details, see [Load Balancer health probes](../../load-balancer/load-balancer-custom-probe-overview.md).
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> * To prevent saptune from changing the manually set `net.ipv4.tcp_timestamps` value from `0` back to `1`, you should update saptune version to 3.1.1 or higher. For more details, see [saptune 3.1.1 – Do I Need to Update?](https://www.suse.com/c/saptune-3-1-1-do-i-need-to-update/).
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> * To prevent saptune from changing the manually set `net.ipv4.tcp_timestamps` value from `0` back to `1`, you should update saptune version to 3.1.1 or higher. For more information, see [saptune 3.1.1 – Do I Need to Update?](https://www.suse.com/c/saptune-3-1-1-do-i-need-to-update/).
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## SAP NFS shares
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SAP NetWeaver requires shared storage for the transport, profile directory, and so on. For highly available SAP system, it is important to have highly available NFS shares. You will need to decide on the architecture for your SAP NFS shares. One option is to build [Highly available NFS cluster on Azure VMs on SUSE Linux Enterprise Server][nfs-ha], which can be shared between multiple SAP systems.
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SAP NetWeaver requires shared storage for the transport, profile directory, and so on. For highly available SAP system, it's important to have highly available NFS shares. You would need to decide on the architecture for your SAP NFS shares. One option is to build [Highly available NFS cluster on Azure VMs on SUSE Linux Enterprise Server][nfs-ha], which can be shared between multiple SAP systems.
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Another option is to deploy the shares on [Azure NetApp Files NFS volumes](../../azure-netapp-files/azure-netapp-files-create-volumes.md). With Azure NetApp Files, you will get built-in high availability for the SAP NFS shares.
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Another option is to deploy the shares on [Azure NetApp Files NFS volumes](../../azure-netapp-files/azure-netapp-files-create-volumes.md). With Azure NetApp Files, you would get built-in high availability for the SAP NFS shares.
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## Deploy the first SAP system in the cluster
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Now that you have decided on the architecture for the SAP NFS shares, deploy the first SAP system in the cluster, following the corresponding documentation.
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Based on the architecture for the SAP NFS shares, deploy the first SAP system in the cluster, following the corresponding documentation.
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* If using highly available NFS server, follow [High availability for SAP NetWeaver on Azure VMs on SUSE Linux Enterprise Server for SAP applications](./high-availability-guide-suse.md).
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* If using Azure NetApp Files NFS volumes, follow [High availability for SAP NetWeaver on Azure VMs on SUSE Linux Enterprise Server with Azure NetApp Files for SAP applications](./high-availability-guide-suse-netapp-files.md)
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The documents listed above will guide you through the steps to prepare the necessary infrastructures, build the cluster, prepare the OS for running the SAP application.
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The documents listed above would guide you through the steps to prepare the necessary infrastructures, build the cluster, prepare the OS for running the SAP application.
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> [!TIP]
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> Always test the fail over functionality of the cluster, after the first system is deployed, before adding the additional SAP SIDs to the cluster. That way you will know that the cluster functionality works, before adding the complexity of additional SAP systems to the cluster.

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