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articles/virtual-machines/disks-deploy-premium-v2.md

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## Adjust disk performance
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Unlike other managed disks, the performance of Premium SSD v2 disks can be configured independently of its size by using the Azure CLI and PowerShell. Making adjustments to disk performance by using the Azure portal is not currently supported.
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Unlike other managed disks, the performance of Premium SSD v2 disks can be configured independently of its size by using the Azure CLI and PowerShell. Making adjustments to disk performance by using the Azure portal is not currently supported. The performance of Premium SSD v2 can only be changed four times within a 24 hour period.
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For conceptual information on adjusting disk performance, see [Premium SSD v2 performance](disks-types.md#premium-ssd-v2-performance).
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articles/virtual-machines/disks-enable-ultra-ssd.md

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# [Portal](#tab/azure-portal)
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Ultra disks offer a unique capability that allows you to adjust their performance. You can make these adjustments from the Azure portal, on the disks themselves.
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Ultra disks offer a unique capability that allows you to adjust their performance. You can make these adjustments from the Azure portal, on the disks themselves. The performance of Ultra Disks can only be changed four times within a 24 hour period.
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1. Navigate to your VM and select **Disks**.
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1. Select the ultra disk you'd like to modify the performance of.
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# [Azure CLI](#tab/azure-cli)
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Ultra disks offer a unique capability that allows you to adjust their performance, the following command depicts how to use this feature:
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Ultra disks offer a unique capability that allows you to adjust their performance. The performance of Ultra Disks can only be changed four times within a 24 hour period. The following command depicts how to use this feature:
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```azurecli-interactive
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az disk update --subscription $subscription --resource-group $rgname --name $diskName --disk-iops-read-write=5000 --disk-mbps-read-write=200
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## Adjust the performance of an ultra disk using PowerShell
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Ultra disks have a unique capability that allows you to adjust their performance, the following command is an example that adjusts the performance without having to detach the disk:
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Ultra disks have a unique capability that allows you to adjust their performance. The performance of Ultra Disks can only be changed four times within a 24 hour period. The following command is an example that adjusts the performance without having to detach the disk:
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```powershell
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$diskupdateconfig = New-AzDiskUpdateConfig -DiskMBpsReadWrite 2000

articles/virtual-machines/disks-types.md

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### Premium SSD v2 performance
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Premium SSD v2 disks are designed to provide sub millisecond latencies and provisioned IOPS and throughput 99.9% of the time. With Premium SSD v2 disks, you can individually set the capacity, throughput, and IOPS of a disk based on your workload needs, providing you with more flexibility and reduced costs. Each of these values determines the cost of your disk.
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Premium SSD v2 disks are designed to provide sub millisecond latencies and provisioned IOPS and throughput 99.9% of the time. With Premium SSD v2 disks, you can individually set the capacity, throughput, and IOPS of a disk based on your workload needs, providing you with more flexibility and reduced costs. Each of these values determines the cost of your disk. The performance of Premium SSD v2 can only be changed four times within a 24 hour period.
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#### Premium SSD v2 capacities
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includes/disks-prem-v2-limitations.md

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- Azure Site Recovery isn't supported for VMs with Premium SSD v2 disks.
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- Azure Backup support for VMs with Premium SSD v2 disks is [generally available](/azure/backup/backup-support-matrix-iaas#vm-storage-support).
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- The size of a Premium SSD v2 can't be expanded without either deallocating the VM or detaching the disk.
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- Premium SSDv2 doesn't support host caching.
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- The performance of Premium SSD v2 can only be changed four times within a 24 hour period.
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- Premium SSDv2 doesn't support host caching.

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

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- Currently only supports Single VM and Availability zone infrastructure options.
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- Snapshots are supported with [additional limitations](../articles/virtual-machines/disks-incremental-snapshots.md#incremental-snapshots-of-premium-ssd-v2-and-ultra-disks).
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- Azure Backup support for VMs with Ultra Disks is [generally available](../articles/backup/backup-support-matrix-iaas.md#vm-storage-support). Azure Backup has limitations when using Ultra Disks, see [VM storage support](../articles/backup/backup-support-matrix-iaas.md#vm-storage-support) for details.
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- The performance of Ultra Disks can only be changed four times within a 24 hour period.
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Ultra disks support a 4k physical sector size by default but also supports a 512E sector size. Most applications are compatible with 4k sector sizes, but some require 512-byte sector sizes. Oracle Database, for example, requires release 12.2 or later in order to support 4k native disks. For older versions of Oracle DB, 512-byte sector size is required.
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