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articles/virtual-machines/linux/disks-enable-ultra-ssd.md

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@@ -4,7 +4,7 @@ description: Learn about ultra disks for Azure VMs
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author: roygara
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ms.service: virtual-machines
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ms.topic: conceptual
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ms.date: 04/08/2020
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ms.date: 04/09/2020
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ms.author: rogarana
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articles/virtual-machines/linux/disks-shared-enable.md

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author: roygara
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articles/virtual-machines/linux/disks-shared.md

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articles/virtual-machines/windows/disks-enable-ultra-ssd.md

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articles/virtual-machines/windows/disks-shared-enable.md

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articles/virtual-machines/windows/disks-shared.md

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includes/managed-disks-ultra-disks-GA-scope-and-limitations.md

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|Regions |No infrastructure Redundancy |Availability zones |
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|---------|---------|---------|
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|West US |Yes | |
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|West US |Yes |No |
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|West US 2 |No |Yes |
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|East US |No |Yes |
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|East US 2 |No |Yes |
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- Doesn't currently support integration with Azure Backup or Azure Site Recovery
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- The current maximum limit for IOPS on GA VMs is 80,000.
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Azure ultra disks offer up to 16 TiB per region per subscription by default, but ultra disks support higher capacity by request. To request an increase in account limits, contact Azure Support.
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Azure ultra disks offer up to 16 TiB per region per subscription by default, but ultra disks support higher capacity by request. To request an increase in capacity, contact Azure Support.

includes/virtual-machines-disks-shared-limitations.md

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While in preview, enabling shared disks is only available to a subset of disk types. Currently only ultra disks and premium SSDs can enable shared disks. Each managed disks that have shared disks enabled are subject to the following limitations, organized by disk type:
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While in preview, enabling shared disks is only available to a subset of disk types. Currently only ultra disks and premium SSDs can enable shared disks. Each managed disk that have shared disks enabled are subject to the following limitations, organized by disk type:
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### Ultra disks
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When sharing ultra disks, they have the following additional limitations:
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- Currently only supported in West US.
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- Currently limited to ARM or SDK support.
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- Currently limited to Azure Resource Manager or SDK support.
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- Only basic disks can be used with some versions of Windows Server Failover Cluster, for details see [Failover clustering hardware requirements and storage options](https://docs.microsoft.com/windows-server/failover-clustering/clustering-requirements).
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### Premium SSDs

includes/virtual-machines-disks-shared.md

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|DiskMBpsReadWrite |The total throughput (MB/s) allowed across all VMs mounting the shared disk with write access. |
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|DiskIOPSReadOnly* |The total number of IOPS allowed across all VMs mounting the shared disk as ReadOnly. |
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|DiskMBpsReadOnly* |The total throughput (MB/s) allowed across all VMs mounting the shared disk as ReadOnly. |
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* Applies to shared ultra disks only
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\* Applies to shared ultra disks only
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The following formulas explain how the performance attributes can be set, since they are user modifiable:
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### Examples
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The following examples depict a few scenarios that show how the throttling can work with shared ultra disks, specifically.
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#### Two nodes cluster using cluster shared volumes
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The following is an example of a 2-node WSFC using clustered shared volumes. With this configuration, both VMs have simultatenous write-access to the disk which results in the ReadWrite throttle being split across the two VMs and the ReadOnly throttle not being used.
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#### Four node Linux cluster
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The following is an example of a 4-node Linux cluster with a single Writer and three scale-out Readers. With this configuration, only one VM has write-access to the disk. This results in the ReadWrite throttle being used exclusively for the primary VM and the ReadOnly throttle being split by the secondary VMs.
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The following is an example of a 4-node Linux cluster with a single writer and three scale-out readers. With this configuration, only one VM has write-access to the disk. This results in the ReadWrite throttle being used exclusively for the primary VM and the ReadOnly throttle being split by the secondary VMs.
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:::image type="complex" source="media/virtual-machines-disks-shared-disks/ultra-four-node-example.png" alt-text="Four node ultra throttling example":::
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