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‎articles/azure-sql/virtual-machines/windows/create-sql-vm-powershell.md

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Define the storage account and the type of storage to be used by the virtual machine.
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Modify as you want, and then run the following cmdlet to initialize these variables. We recommend using [premium SSDs](../../../virtual-machines/disks-types.md#premium-ssd) for production workloads.
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Modify as you want, and then run the following cmdlet to initialize these variables. We recommend using [premium SSDs](../../../virtual-machines/disks-types.md#premium-ssds) for production workloads.
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```powershell
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$StorageName = $ResourceGroupName + "storage"

‎articles/azure-sql/virtual-machines/windows/performance-guidelines-best-practices-checklist.md

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- Monitor the application and [determine storage bandwidth and latency requirements](../../../virtual-machines/premium-storage-performance.md#counters-to-measure-application-performance-requirements) for SQL Server data, log, and tempdb files before choosing the disk type.
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- To optimize storage performance, plan for highest uncached IOPS available and use data caching as a performance feature for data reads while avoiding [virtual machine and disks capping/throttling](../../../virtual-machines/premium-storage-performance.md#throttling).
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- Place data, log, and tempdb files on separate drives.
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- For the data drive, only use [premium P30 and P40 disks](../../../virtual-machines/disks-types.md#premium-ssd) to ensure the availability of cache support
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- For the log drive plan for capacity and test performance versus cost while evaluating the [premium P30 - P80 disks](../../../virtual-machines/disks-types.md#premium-ssd).
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- For the data drive, only use [premium P30 and P40 disks](../../../virtual-machines/disks-types.md#premium-ssds) to ensure the availability of cache support
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- For the log drive plan for capacity and test performance versus cost while evaluating the [premium P30 - P80 disks](../../../virtual-machines/disks-types.md#premium-ssds).
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- If submillisecond storage latency is required, use [Azure ultra disks](../../../virtual-machines/disks-types.md#ultra-disks) for the transaction log.
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- For M-series virtual machine deployments consider [Write Accelerator](../../../virtual-machines/how-to-enable-write-accelerator.md) over using Azure ultra disks.
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- Place [tempdb](/sql/relational-databases/databases/tempdb-database) on the local ephemeral SSD (default `D:\`) drive for most SQL Server workloads after choosing the optimal VM size.

‎articles/azure-sql/virtual-machines/windows/performance-guidelines-best-practices-storage.md

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- Monitor the application and [determine storage bandwidth and latency requirements](../../../virtual-machines/premium-storage-performance.md#counters-to-measure-application-performance-requirements) for SQL Server data, log, and tempdb files before choosing the disk type.
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- To optimize storage performance, plan for highest uncached IOPS available and use data caching as a performance feature for data reads while avoiding [virtual machine and disks capping](../../../virtual-machines/premium-storage-performance.md#throttling).
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- Place data, log, and tempdb files on separate drives.
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- For the data drive, only use [premium P30 and P40 disks](../../../virtual-machines/disks-types.md#premium-ssd) to ensure the availability of cache support
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- For the log drive plan for capacity and test performance versus cost while evaluating the [premium P30 - P80 disks](../../../virtual-machines/disks-types.md#premium-ssd)
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- For the data drive, only use [premium P30 and P40 disks](../../../virtual-machines/disks-types.md#premium-ssds) to ensure the availability of cache support
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- For the log drive plan for capacity and test performance versus cost while evaluating the [premium P30 - P80 disks](../../../virtual-machines/disks-types.md#premium-ssds)
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- If submillisecond storage latency is required, use [Azure ultra disks](../../../virtual-machines/disks-types.md#ultra-disks) for the transaction log.
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- For M-series virtual machine deployments consider [write accelerator](../../../virtual-machines/how-to-enable-write-accelerator.md) over using Azure ultra disks.
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- Place [tempdb](/sql/relational-databases/databases/tempdb-database) on the local ephemeral SSD `D:\` drive for most SQL Server workloads after choosing the optimal VM size.
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You have a choice in the performance level for your disks. The types of managed disks available as underlying storage (listed by increasing performance capabilities) are standard hard disk drives (HDD), standard SSDs, premium solid-state drives (SSD), and ultra disks.
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The performance of the disk increases with the capacity, grouped by [premium disk labels](../../../virtual-machines/disks-types.md#premium-ssd) such as the P1 with 4 GiB of space and 120 IOPS to the P80 with 32 TiB of storage and 20,000 IOPS. Premium storage supports a storage cache that helps improve read and write performance for some workloads. For more information, see [Managed disks overview](../../../virtual-machines/managed-disks-overview.md).
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The performance of the disk increases with the capacity, grouped by [premium disk labels](../../../virtual-machines/disks-types.md#premium-ssds) such as the P1 with 4 GiB of space and 120 IOPS to the P80 with 32 TiB of storage and 20,000 IOPS. Premium storage supports a storage cache that helps improve read and write performance for some workloads. For more information, see [Managed disks overview](../../../virtual-machines/managed-disks-overview.md).
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There are also three main [disk types](../../../virtual-machines/managed-disks-overview.md#disk-roles) to consider for your SQL Server on Azure VM - an OS disk, a temporary disk, and your data disks. Carefully choose what is stored on the operating system drive `(C:\)` and the ephemeral temporary drive `(D:\)`.
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Use Storage Spaces to achieve optimal performance, configure two pools, one for the log file(s) and the other for the data files. If you are not using disk striping, use two premium SSD disks mapped to separate drives, where one drive contains the log file and the other contains the data.
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The [provisioned IOPS and throughput](../../../virtual-machines/disks-types.md#premium-ssd) per disk that is used as part of your storage pool. The combined IOPS and throughput capabilities of the disks is the maximum capability up to the throughput limits of the virtual machine.
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The [provisioned IOPS and throughput](../../../virtual-machines/disks-types.md#premium-ssds) per disk that is used as part of your storage pool. The combined IOPS and throughput capabilities of the disks is the maximum capability up to the throughput limits of the virtual machine.
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The best practice is to use the least number of disks possible while meeting the minimal requirements for IOPS (and throughput) and capacity. However, the balance of price and performance tends to be better with a large number of small disks rather than a small number of large disks.
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‎articles/azure-sql/virtual-machines/windows/storage-configuration.md

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The disk configuration is completely customizable so that you can configure the storage topology, disk type and IOPs you need for your SQL Server VM workload. You also have the ability to use UltraSSD (preview) as an option for the **Disk type** if your SQL Server VM is in one of the supported regions (East US 2, SouthEast Asia and North Europe) and you've enabled [ultra disks for your subscription](../../../virtual-machines/disks-enable-ultra-ssd.md).
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Additionally, you have the ability to set the caching for the disks. Azure VMs have a multi-tier caching technology called [Blob Cache](../../../virtual-machines/premium-storage-performance.md#disk-caching) when used with [Premium Disks](../../../virtual-machines/disks-types.md#premium-ssd). Blob Cache uses a combination of the Virtual Machine RAM and local SSD for caching.
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Additionally, you have the ability to set the caching for the disks. Azure VMs have a multi-tier caching technology called [Blob Cache](../../../virtual-machines/premium-storage-performance.md#disk-caching) when used with [Premium Disks](../../../virtual-machines/disks-types.md#premium-ssds). Blob Cache uses a combination of the Virtual Machine RAM and local SSD for caching.
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Disk caching for Premium SSD can be *ReadOnly*, *ReadWrite* or *None*.
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‎articles/azure-vmware/attach-disk-pools-to-azure-vmware-solution-hosts.md

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# Attach disk pools to Azure VMware Solution hosts (Preview)
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[Azure disk pools](../virtual-machines/disks-pools.md) offer persistent block storage to applications and workloads backed by Azure Disks. You can use disks as the persistent storage for Azure VMware Solution for optimal cost and performance. For example, you can scale up by using disk pools instead of scaling clusters if you host storage-intensive workloads. You can also use disks to replicate data from on-premises or primary VMware environments to disk storage for the secondary site. To scale storage independent of the Azure VMware Solution hosts, we support surfacing [ultra disks](../virtual-machines/disks-types.md#ultra-disks) and [premium SSD](../virtual-machines/disks-types.md#premium-ssd) as the datastores.
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[Azure disk pools](../virtual-machines/disks-pools.md) offer persistent block storage to applications and workloads backed by Azure Disks. You can use disks as the persistent storage for Azure VMware Solution for optimal cost and performance. For example, you can scale up by using disk pools instead of scaling clusters if you host storage-intensive workloads. You can also use disks to replicate data from on-premises or primary VMware environments to disk storage for the secondary site. To scale storage independent of the Azure VMware Solution hosts, we support surfacing [ultra disks](../virtual-machines/disks-types.md#ultra-disks) and [premium SSD](../virtual-machines/disks-types.md#premium-ssds) as the datastores.
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>[!IMPORTANT]
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>Azure disk pools on Azure VMware Solution (Preview) is currently in public preview.

‎articles/hdinsight/hbase/apache-hbase-accelerated-writes.md

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# Azure HDInsight Accelerated Writes for Apache HBase
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This article provides background on the **Accelerated Writes** feature for Apache HBase in Azure HDInsight, and how it can be used effectively to improve write performance. **Accelerated Writes** uses [Azure premium SSD managed disks](../../virtual-machines/disks-types.md#premium-ssd) to improve performance of the Apache HBase Write Ahead Log (WAL). To learn more about Apache HBase, see [What is Apache HBase in HDInsight](apache-hbase-overview.md).
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This article provides background on the **Accelerated Writes** feature for Apache HBase in Azure HDInsight, and how it can be used effectively to improve write performance. **Accelerated Writes** uses [Azure premium SSD managed disks](../../virtual-machines/disks-types.md#premium-ssds) to improve performance of the Apache HBase Write Ahead Log (WAL). To learn more about Apache HBase, see [What is Apache HBase in HDInsight](apache-hbase-overview.md).
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## Overview of HBase architecture
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‎articles/service-fabric/how-to-managed-cluster-managed-disk.md

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* Standard HDD locally redundant storage. Best for backup, non-critical, and infrequent access.
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* Standard SSD *Default*
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* Standard SSD locally redundant storage. Best for web servers, lightly used enterprise applications and dev/test.
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* Premium SSD *Compatible with specific VM sizes* for more information see [Premium SSD](../virtual-machines/disks-types.md#premium-ssd)
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* Premium SSD *Compatible with specific VM sizes* for more information see [Premium SSD](../virtual-machines/disks-types.md#premium-ssds)
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* Premium SSD locally redundant storage. Best for production and performance sensitive workloads.
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>[!NOTE]

‎articles/virtual-machines/disk-bursting.md

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## Disk-level bursting
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Currently, there are two managed disk types that can burst, [premium SSDs](disks-types.md#premium-ssd), and [standard SSDs](disks-types.md#standard-ssd). Other disk types cannot currently burst. There are two models of bursting for disks:
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Currently, there are two managed disk types that can burst, [premium SSDs](disks-types.md#premium-ssds), and [standard SSDs](disks-types.md#standard-ssd). Other disk types cannot currently burst. There are two models of bursting for disks:
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- An on-demand bursting model (preview), where the disk bursts whenever its needs exceed its current capacity. This model incurs additional charges anytime the disk bursts. On-demand bursting is only available for premium SSDs larger than 512 GiB.
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- A credit-based model, where the disk will burst only if it has burst credits accumulated in its credit bucket. This model does not incur additional charges when the disk bursts. Credit-based bursting is only available for premium and standard SSDs 512 GiB and smaller.
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Azure [premium SSDs](disks-types.md#premium-ssd) can use either bursting model, but [standard SSDs](disks-types.md#standard-ssd) currently only offer credit-based bursting.
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Azure [premium SSDs](disks-types.md#premium-ssds) can use either bursting model, but [standard SSDs](disks-types.md#standard-ssd) currently only offer credit-based bursting.
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‎articles/virtual-machines/workloads/sap/businessobjects-deployment-guide.md

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- Azure-managed disks
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It's a block-level storage volume that is managed by Azure. You can use the disks for SAP BOBI Platform application servers and databases, when installed on Azure virtual machines. There are different types of [Azure Managed Disks](../../managed-disks-overview.md) available, but it's recommended to use [Premium SSDs](../../disks-types.md#premium-ssd) for SAP BOBI Platform application and database.
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It's a block-level storage volume that is managed by Azure. You can use the disks for SAP BOBI Platform application servers and databases, when installed on Azure virtual machines. There are different types of [Azure Managed Disks](../../managed-disks-overview.md) available, but it's recommended to use [Premium SSDs](../../disks-types.md#premium-ssds) for SAP BOBI Platform application and database.
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In below example, Premium SSDs are used for BOBI Platform installation directory. For database installed on virtual machine, you can use managed disks for data and log volume as per the guidelines. CMS and Audit databases are typically small and it doesn’t have the same storage performance requirements as that of other SAP OLTP/OLAP databases.
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‎articles/virtual-machines/workloads/sap/dbms_guide_sqlserver.md

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* Considerations listed earlier regarding the distribution of VHDs over different Azure Storage Accounts apply for this method of deployments as well. Means the I/O operations count against the limits of the Azure Storage Account.
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* Instead of accounting against the VM's storage I/O quota, the traffic against storage blobs representing the SQL Server data and log files, will be accounted into the VM's network bandwidth of the specific VM type. For network and storage bandwidth of a particular VM type, consult the article [Sizes for Windows virtual machines in Azure](../../sizes.md).
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* As a result of pushing file I/O through the network quota, you are stranding the storage quota mostly and with that use the overall bandwidth of the VM only partially.
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* The IOPS and I/O throughput Performance targets that Azure Premium Storage has for the different disk sizes do not apply anymore. Even if the blobs you created are located on Azure Premium Storage. The targets are documented the article [High-performance Premium Storage and managed disks for VMs](../../disks-types.md#premium-ssd). As a result of placing SQL Server data files and log files directly on blobs that are stored on Azure Premium Storage, the performance characteristics can be different compared to VHDs on Azure Premium Storage.
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* The IOPS and I/O throughput Performance targets that Azure Premium Storage has for the different disk sizes do not apply anymore. Even if the blobs you created are located on Azure Premium Storage. The targets are documented the article [High-performance Premium Storage and managed disks for VMs](../../disks-types.md#premium-ssds). As a result of placing SQL Server data files and log files directly on blobs that are stored on Azure Premium Storage, the performance characteristics can be different compared to VHDs on Azure Premium Storage.
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‎articles/virtual-machines/workloads/sap/high-availability-guide-rhel-netapp-files.md

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6. volume sap<b>QAS</b> (nfs://192.168.24.5/usrsap<b>qas</b>/usrsap<b>QAS</b>pas)
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In this example, we used Azure NetApp Files for all SAP Netweaver file systems to demonstrate how Azure NetApp Files can be used. The SAP file systems that don't need to be mounted via NFS can also be deployed as [Azure disk storage](../../disks-types.md#premium-ssd) . In this example <b>a-e</b> must be on Azure NetApp Files and <b>f-g</b> (that is, /usr/sap/<b>QAS</b>/D<b>02</b>, /usr/sap/<b>QAS</b>/D<b>03</b>) could be deployed as Azure disk storage.
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In this example, we used Azure NetApp Files for all SAP Netweaver file systems to demonstrate how Azure NetApp Files can be used. The SAP file systems that don't need to be mounted via NFS can also be deployed as [Azure disk storage](../../disks-types.md#premium-ssds) . In this example <b>a-e</b> must be on Azure NetApp Files and <b>f-g</b> (that is, /usr/sap/<b>QAS</b>/D<b>02</b>, /usr/sap/<b>QAS</b>/D<b>03</b>) could be deployed as Azure disk storage.
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### Important considerations
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‎articles/virtual-machines/workloads/sap/high-availability-guide-suse-netapp-files.md

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In this example, we used Azure NetApp Files for all SAP Netweaver file systems to demonstrate how Azure NetApp Files can be used. The SAP file systems that don't need to be mounted via NFS can also be deployed as [Azure disk storage](../../disks-types.md#premium-ssd) . In this example <b>a-e</b> must be on Azure NetApp Files and <b>f-g</b> (that is, /usr/sap/<b>QAS</b>/D<b>02</b>, /usr/sap/<b>QAS</b>/D<b>03</b>) could be deployed as Azure disk storage.
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In this example, we used Azure NetApp Files for all SAP Netweaver file systems to demonstrate how Azure NetApp Files can be used. The SAP file systems that don't need to be mounted via NFS can also be deployed as [Azure disk storage](../../disks-types.md#premium-ssds) . In this example <b>a-e</b> must be on Azure NetApp Files and <b>f-g</b> (that is, /usr/sap/<b>QAS</b>/D<b>02</b>, /usr/sap/<b>QAS</b>/D<b>03</b>) could be deployed as Azure disk storage.
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‎articles/virtual-machines/workloads/sap/planning-guide-storage.md

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Cost basis in the case of Azure premium storage is not the actual data volume stored in such disks, but the size category of such a disk, independent of the amount of the data that is stored within the disk. You also can create disks on premium storage that are not directly mapping into the size categories shown in the article [Premium SSD](../../disks-types.md#premium-ssds). Conclusions out of this article are:
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- The storage is organized in ranges. For example, a disk in the range 513 GiB to 1024 GiB capacity share the same capabilities and the same monthly costs
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- The IOPS per GiB are not tracking linear across the size categories. Smaller disks below 32 GiB have higher IOPS rates per GiB. For disks beyond 32 GiB to 1024 GiB, the IOPS rate per GiB is between 4-5 IOPS per GiB. For larger disks up to 32,767 GiB, the IOPS rate per GiB is going below 1

‎articles/virtual-machines/workloads/sap/sap-ascs-ha-multi-sid-wsfc-azure-shared-disk.md

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- [Azure Ultra disk](../../disks-types.md#ultra-disks) and [Standard SSD disks](../../disks-types.md#standard-ssd) are not supported as Azure Shared Disk for SAP workloads.
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- [Azure Shared disk](../../disks-shared.md) with [Premium SSD disks](../../disks-types.md#premium-ssd) is supported for SAP deployment in availability set and availability zones.
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- [Azure Shared disk](../../disks-shared.md) with [Premium SSD disks](../../disks-types.md#premium-ssds) is supported for SAP deployment in availability set and availability zones.
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‎articles/virtual-machines/workloads/sap/sap-deployment-checklist.md

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- Check the document [Azure Storage types for SAP workload](./planning-guide-storage.md)
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- At a minimum, use [Azure Standard SSD storage](../../disks-types.md#standard-ssd) for VMs that represent SAP application layers and for deployment of DBMSs that aren't performance sensitive.
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- In general, we don't recommend the use of [Azure Standard HDD disks](../../disks-types.md#standard-hdd).
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- Use [Azure Premium Storage](../../disks-types.md#premium-ssd) for any DBMS VMs that are remotely performance sensitive.
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- Use [Azure Premium Storage](../../disks-types.md#premium-ssds) for any DBMS VMs that are remotely performance sensitive.
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- Use Azure Write Accelerator for DBMS log drives with M-Series. Be aware of Write Accelerator limits and usage, as documented in [Write Accelerator](../../how-to-enable-write-accelerator.md).
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- For the different DBMS types, check the [generic SAP-related DBMS documentation](./dbms_guide_general.md) and the DBMS-specific documentation that the generic document points to.

‎articles/virtual-machines/workloads/sap/sap-high-availability-guide-wsfc-shared-disk.md

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- [Azure shared disk](../../disks-shared.md) with [Premium SSD](../../disks-types.md#premium-ssds) disks is supported for SAP deployment in availability set and availability zones.
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- [Azure Shared disk](../../disks-shared.md) with [Premium SSD disks](../../disks-types.md#premium-ssds) is supported for SAP deployment in availability set and availability zones.
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- Azure shared disk with Premium SSD disks comes with two storage SKUs.
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- Locally redundant storage (LRS) for premium shared disk (skuName - Premium_LRS) is supported with deployment in Azure availability set.
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- Zone-redundant storage (ZRS) for premium shared disk (skuName - Premium_ZRS) is supported with deployment in Azure availability zones.

‎articles/virtual-machines/workloads/sap/sap-iq-deployment-guide.md

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@@ -94,7 +94,7 @@ For SAP IQ on Azure, you can use the following Azure storage types. The choice d
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- Azure managed disks
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A [managed disk](../../managed-disks-overview.md) is a block-level storage volume that Azure manages. You can use managed disks for SAP IQ simplex deployment. Various types of managed disks are available, but we recommend that you use [premium SSDs](../../disks-types.md#premium-ssd) for SAP IQ.
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A [managed disk](../../managed-disks-overview.md) is a block-level storage volume that Azure manages. You can use managed disks for SAP IQ simplex deployment. Various types of managed disks are available, but we recommend that you use [premium SSDs](../../disks-types.md#premium-ssds) for SAP IQ.
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- Azure shared disks
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