Merge pull request #107153 from msjuergent/anflimits

State maximum throughput limit for single Linux VM against a single N…

Author: PRMerger13

articles/virtual-machines/workloads/sap/get-started.md

@@ -15,7 +15,7 @@ ms.service: virtual-machines-linux
 ms.topic: article
 ms.tgt_pltfrm: vm-linux
 ms.workload: infrastructure-services
-ms.date: 03/09/2020
+ms.date: 03/10/2020
 ms.author: juergent
 ms.custom: H1Hack27Feb2017
 
@@ -109,6 +109,7 @@ For information on integration of Azure services into SAP components, see:
 
 
 ## Change Log
+- 03/10/2020: Change in [SAP HANA Azure virtual machine storage configurations](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/hana-vm-operations-storage) to clarify real existing throughput limits of ANF
 - 03/09/2020: Change in [High availability for SAP NetWeaver on Azure VMs on SUSE Linux Enterprise Server for SAP applications](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/high-availability-guide-suse), [High availability for SAP NetWeaver on Azure VMs on SUSE Linux Enterprise Server with Azure NetApp Files for SAP applications](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/high-availability-guide-suse-netapp-files), [High availability for NFS on Azure VMs on SUSE Linux Enterprise Server](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/high-availability-guide-suse-nfs), [Setting up Pacemaker on SUSE Linux Enterprise Server in Azure](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/high-availability-guide-suse-pacemaker), [High availability of IBM Db2 LUW on Azure VMs on SUSE Linux Enterprise Server with Pacemaker](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/dbms-guide-ha-ibm), [High availability of SAP HANA on Azure VMs on SUSE Linux Enterprise Server](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/sap-hana-high-availability) and [High availability for SAP NetWeaver on Azure VMs on RHEL multi-SID guide](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/high-availability-guide-rhel-multi-sid) to update cluster resources with resource agent azure-lb 
 - 03/05/2020: Structure changes and content changes for Azure Regions and Azure Virtual machines in [Azure Virtual Machines planning and implementation for SAP NetWeaver](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/planning-guide)
 - 03/03/2020: Change in [High availability for SAP NW on Azure VMs on SLES with ANF for SAP applications](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/high-availability-guide-suse-netapp-files) to change to more efficient ANF volume layout

articles/virtual-machines/workloads/sap/hana-vm-operations-storage.md

@@ -14,7 +14,7 @@ ms.service: virtual-machines-linux
 ms.topic: article
 ms.tgt_pltfrm: vm-linux
 ms.workload: infrastructure
-ms.date: 02/26/2020
+ms.date: 03/10/2020
 ms.author: juergent
 ms.custom: H1Hack27Feb2017
 
@@ -278,6 +278,9 @@ The [Azure NetApp Files throughput limits](https://docs.microsoft.com/azure/azur
 - Premium Storage Tier - 64 MiB/s  
 - Ultra Storage Tier - 128 MiB/s  
 
+> [!IMPORTANT]
+> Independent of the capacity you deploy on a single NFS volume, the throughput, is expected to plateau in the range of 1.2-1.4 GB/sec bandwidth leveraged by a consumer in a virtual machine. This has to do with the underlying architecture of the ANF offer and related Linux session limits around NFS. The performance and throughput numbers as documented in the article [Performance benchmark test results for Azure NetApp Files](https://docs.microsoft.com/azure/azure-netapp-files/azure-netapp-files-performance-benchmarks) were conducted against one shared NFS volume with multiple client VMs and as a result with multiple sessions. That scenario is different to the scenario we measure in SAP. Where we measure throughput from a single VM against an NFS volume. hosted on ANF.
+
 To meet the SAP minimum throughput requirements for data and log, and according to the guidelines for `/hana/shared`, the recommended sizes would look like:
 
 | Volume | Size<br /> Premium Storage tier | Size<br /> Ultra Storage tier | Supported NFS protocol |