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articles/sap/workloads/virtual-machine-scale-set-sap-deployment-guide.md

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ms.date: 03/20/2024
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---
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# Virtual Machine Scale Sets for SAP workload
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In Azure, [Virtual machine scale sets](../../virtual-machine-scale-sets/overview.md) provide a logical grouping of platform-managed virtual machines.
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- Virtual machine scale sets offer two [orchestration modes](../../virtual-machine-scale-sets/virtual-machine-scale-sets-orchestration-modes.md) that enable improved virtual machine management. **For SAP workloads, the Virtual Machines Scale Set with [flexible orchestration](../../virtual-machine-scale-sets/virtual-machine-scale-sets-orchestration-modes.md#scale-sets-with-flexible-orchestration) is the recommended and only supported option**, as it offers the ability to use different virtual machine SKUs and operating systems within a single scale set.
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2. For SAP workloads, flexible orchestration of virtual machine scale sets is supported only with FD=1. Currently regional deployment with FD>1 isn't supported for SAP workload.
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3. Deploy each SAP system in a separate flexible scale set.
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4. For SAP NetWeaver, it's recommended to deploy all components of a single SAP system within a single flexible scale set. These components include the database, SAP ASCS/ERS, and SAP application servers.
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5. Different VM SKUs, such as D-Series, E-Series, M-Series, and operating systems, including Windows and various Linux distributions, can be included within a single virtual machine scale set with flexible orchestration.
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5. Different virtual machine (VM) SKUs, such as D-Series, E-Series, M-Series, and operating systems, including Windows and various Linux distributions, can be included within a single virtual machine scale set with flexible orchestration.
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6. When setting up a flexible scale set for SAP workload, `platformFaultDomainCount` can be set to a maximum value of 1. As a result, the virtual machine instances associated with the scale set would be distributed across multiple fault domains on a best effort basis.
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7. You can configure flexible virtual machine scale sets with or without a scaling profile. However, it's recommended to create a flexible virtual machine scale set without a scaling profile.
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8. The standard load balancer is the only supported load balancer for virtual machines deployed in flexible scale set.
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To set up a virtual machine scale set without scaling profile using Azure portal, proceed as follows -
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1. Login to [Azure portal](https://portal.azure.com).
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1. Search for "Virtual machine scale set" and select "create" on the corresponding page.
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1. Sign in to [Azure portal](https://portal.azure.com).
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1. Search for **Virtual machine scale set** and select **create** on the corresponding page.
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1. In the basics tab, provide the necessary details:
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1. Under project details, verify the correct "subscription" and choose "my-resource-group" from the resource group dropdown.
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1. For scale set details, name your scale set myVmssFlex”. Choose the appropriate "region" and specify "availability zone" (For example, zone1, zone2, zone3) for your deployment.
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1. Select the "flexible" orchestration mode
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1. Under the scaling section, select "no scaling profile".
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1. For the allocation policy, select "max spreading"
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1. Select "create"
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1. Under project details, verify the correct **subscription** and choose **my-resource-group** from the resource group dropdown.
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1. For scale set details, name your scale set **myVmssFlex**, choose the appropriate **region**, and specify **availability zone** (For example, zone1, zone2, zone3) for your deployment.
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1. Select the **flexible** orchestration mode.
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1. Under the scaling section, select **no scaling profile**.
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1. For the allocation policy, select **max spreading**.
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1. Select **create**.
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> [!NOTE]
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> For SAP workload only flexible scale set with FD=1 is supported. So, do not configure scale set with "fixed spreading" as the allocation policy.

articles/sap/workloads/virtual-machine-scale-set-sap-faq.md

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# FAQs for Virtual Machine Scale Set for SAP workload
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Get answers to frequently asked questions about Virtual Machine Scale Sets for SAP workload
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Get answers to frequently asked questions about Virtual Machine Scale Sets for SAP workload.
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## SAP workload deployment
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### How can I migrate my current Availability set or Availability zone deployment of SAP workload to flexible scale set with zonal deployment (FD=1)?
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To migrate SAP VMs to a flexible scale set, you need to re-create the VMs and the disks with zone constraints (if required) from existing resources. There is no direct way to migrate SAP workloads deployed in availability sets or availability zones to flexible scale with FD=1. An [open-source project](https://github.com/Azure/SAP-on-Azure-Scripts-and-Utilities/tree/main/Move-VM-from-AvSet-to-AvZone/Move-Regional-SAP-HA-To-Zonal-SAP-HA-WhitePaper) includes PowerShell functions that you can use as a sample, and a [blog post](https://techcommunity.microsoft.com/t5/running-sap-applications-on-the/how-to-easily-migrate-an-existing-sap-system-vms-to-flexible/ba-p/3833548) shows you how to modify a HA or non-HA SAP system deployed in availability set or availability zone to flexible scale set with FD=1.
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To migrate SAP VMs to a flexible scale set, you need to re-create the VMs and the disks with zone constraints (if necessary) from existing resources. There's no direct way to migrate SAP workloads deployed in availability sets or availability zones to flexible scale with FD=1. An [open-source project](https://github.com/Azure/SAP-on-Azure-Scripts-and-Utilities/tree/main/Move-VM-from-AvSet-to-AvZone/Move-Regional-SAP-HA-To-Zonal-SAP-HA-WhitePaper) includes PowerShell functions that you can use as a sample, and a [blog post](https://techcommunity.microsoft.com/t5/running-sap-applications-on-the/how-to-easily-migrate-an-existing-sap-system-vms-to-flexible/ba-p/3833548) shows you how to modify a HA or non-HA SAP system deployed in availability set or availability zone to flexible scale set with FD=1.
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### How can an existing deployment of SAP HANA, which is [pinned](../../azure-netapp-files/application-volume-group-considerations.md#best-practices-about-proximity-placement-groups) to Azure NetApp Files, be migrated to flexible scale set with FD=1?
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