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articles/virtual-machines/workloads/sap/hana-storage-architecture.md

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In this article, we'll look at the storage architecture for deploying SAP HANA on Azure Large Instances (also known as BareMetal Infrastructure).
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The storage layout for SAP HANA on Azure (Large Instances) is configured by SAP HANA on the classic deployment model per SAP recommended guidelines. For more information on the guidelines, see [SAP HANA storage requirements](https://archive.sap.com/kmuuid2/70c8e423-c8aa-3210-3fae-e043f5c1ca92/SAP%20HANA%20TDI%20-%20Storage%20Requirements.pdf).
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The storage layout for SAP HANA on Azure (Large Instances) is configured by SAP HANA on the classic deployment model per SAP recommended guidelines. For more information on the guidelines, see [SAP HANA storage requirements](https://blogs.saphana.com/wp-content/uploads/2015/02/Storage-Whitepaper-2-54.pdf).
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Type I class of HANA Large Instances come with four times the memory volume as storage volume. Whereas Type II class of HANA Large Instances come with a volume intended for storing HANA transaction log backups. For more information, see [Install and configure SAP HANA (Large Instances) on Azure](hana-installation.md).
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articles/virtual-machines/workloads/sap/hana-vm-operations-storage.md

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> Ultra disk is not yet present in all the Azure regions and is also not yet supporting all VM types listed below. For detailed information where Ultra disk is available and which VM families are supported, check the article [What disk types are available in Azure?](../../disks-types.md#ultra-disks).
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### Production recommended storage solution with pure Ultra disk configuration
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In this configuration, you keep the **/hana/data** and **/hana/log** volumes separately. The suggested values are derived out of the KPIs that SAP has to certify VM types for SAP HANA and storage configurations as recommended in the [SAP TDI Storage Whitepaper](https://blogs.saphana.com/wp-content/uploads/2015/02/Storage-Whitepaper-2-54.pdf).
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In this configuration, you keep the **/hana/data** and **/hana/log** volumes separately. The suggested values are derived out of the KPIs that SAP has to certify VM types for SAP HANA and storage configurations as recommended in the [SAP TDI Storage Whitepaper](https://archive.sap.com/kmuuid2/70c8e423-c8aa-3210-3fae-e043f5c1ca92/SAP%20HANA%20TDI%20-%20Storage%20Requirements.pdf).
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The recommendations are often exceeding the SAP minimum requirements as stated earlier in this article. The listed recommendations are a compromise between the size recommendations by SAP and the maximum storage throughput the different VM types provide.
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## Next steps
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For more information, see:
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- [SAP HANA High Availability guide for Azure virtual machines](./sap-hana-availability-overview.md).
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- [SAP HANA High Availability guide for Azure virtual machines](./sap-hana-availability-overview.md).

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

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- All other disk volumes are not shared among the different nodes and are not based on NFS. Installation configurations and steps for scale-out HANA installations with non-shared **/hana/data** and **/hana/log** is provided further later in this document. For HANA certified storage that can be used, check the article [SAP HANA Azure virtual machine storage configurations](./hana-vm-operations-storage.md).
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Sizing the volumes or disks, you need to check the document [SAP HANA TDI Storage Requirements](https://blogs.saphana.com/wp-content/uploads/2015/02/Storage-Whitepaper-2-54.pdf), for the size required dependent on the number of worker nodes. The document releases a formula you need to apply to get the required capacity of the volume
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Sizing the volumes or disks, you need to check the document [SAP HANA TDI Storage Requirements](https://archive.sap.com/kmuuid2/70c8e423-c8aa-3210-3fae-e043f5c1ca92/SAP%20HANA%20TDI%20-%20Storage%20Requirements.pdf), for the size required dependent on the number of worker nodes. The document releases a formula you need to apply to get the required capacity of the volume
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The other design criteria that is displayed in the graphics of the single node configuration for a scale-out SAP HANA VM is the VNet, or better the subnet configuration. SAP highly recommends a separation of the client/application facing traffic from the communications between the HANA nodes. As shown in the graphics, this goal is achieved by having two different vNICs attached to the VM. Both vNICs are in different subnets, have two different IP addresses. You then control the flow of traffic with routing rules using NSGs or user-defined routes.
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