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Copy file name to clipboardExpand all lines: includes/disks-prem-v2-limitations.md
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author: roygara
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ms.service: storage
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ms.topic: include
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ms.date: 02/13/2023
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ms.date: 03/27/2023
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ms.author: rogarana
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- Currently, encryption at host isn't supported for Premium SSD v2 disks. You can still attach Premium SSD v2 disks to VMs where you have enabled encryption at host for disk types.
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- Azure Disk Encryption (guest VM encryption via Bitlocker/DM-Crypt) isn't supported for VMs with Premium SSD v2 disks. We recommend you to use encryption at rest with platform-managed or customer-managed keys, which is supported for Premium SSD v2.
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- Currently, Premium SSD v2 disks can't be attached to VMs in Availability Sets.
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- Azure Backup and Azure Site Recovery aren't supported for VMs with Premium SSD v2 disks.
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- Azure Backup and Azure Site Recovery aren't supported for VMs with Premium SSD v2 disks.
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- The size of a Premium SSD v2 can't be expanded without either deallocating the VM or detaching the disk.
Copy file name to clipboardExpand all lines: includes/managed-disks-ultra-disks-GA-scope-and-limitations.md
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author: roygara
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ms.service: virtual-machines
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ms.topic: include
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ms.date: 03/07/2023
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Ultra disks can't be used as OS disks, they can only be created as empty data disks. Ultra disks also can't be used with some features and functionality, including disk export, changing disk type, VM images, availability sets, or Azure disk encryption. Azure Backup and Azure Site Recovery do not support ultra disks. In addition, only un-cached reads and un-cached writes are supported. Currently, snapshots for ultra disks are available as a public preview and only in Sweden Central and US West 3, they aren't available in any other region.
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Ultra disks can't be used as OS disks, they can only be created as empty data disks. Ultra disks also can't be used with some features and functionality, including disk export, changing disk type, VM images, availability sets, or Azure disk encryption. The size of an Ultra Disk can't be expanded without either deallocating the VM or detaching the disk. Azure Backup and Azure Site Recovery do not support ultra disks. In addition, only un-cached reads and un-cached writes are supported. Currently, snapshots for ultra disks are available as a public preview and only in Sweden Central and US West 3, they aren't available in any other region.
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Ultra disks support a 4k physical sector size by default. A 512E sector size is available as a generally available offering with no sign-up required. While most applications are compatible with 4k sector sizes, 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.
Copy file name to clipboardExpand all lines: includes/virtual-machines-disks-shared-limitations.md
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ms.service: virtual-machines
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ms.date: 09/29/2022
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### General limitations
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Enabling shared disks is only available to a subset of disk types. Currently only ultra disks, premium SSD v2 managed disks, premium SSD managed disks, and standard SSDs can enable shared disks. Shared disks can be attached to individual Virtual Machine Scale Sets but can't be defined in the Virtual Machine Scale Set models or automatically deployed.
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Enabling shared disks is only available to a subset of disk types. Currently only ultra disks, premium SSD v2 managed disks, premium SSD managed disks, and standard SSDs can enable shared disks. Shared disks can be attached to individual Virtual Machine Scale Sets but can't be defined in the Virtual Machine Scale Set models or automatically deployed. A shared disk can't be expanded without either deallocating the VMs or detaching the disk.
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> [!IMPORTANT]
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> Host caching isn't supported for shared disks.
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- Can only be enabled on data disks, not OS disks.
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- Host caching isn't available for premium SSD disks with `maxShares>1`.
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- Disk bursting isn't available for premium SSD disks with `maxShares>1`.
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- When using Availability sets or virtual machine scale sets with Azure shared disks, [storage fault domain alignment](../articles/virtual-machines/availability.md) with virtual machine fault domain isn't enforced for the shared data disk.
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- When using Availability sets or Virtual Machine Scale Sets with Azure shared disks, [storage fault domain alignment](../articles/virtual-machines/availability.md) with virtual machine fault domain isn't enforced for the shared data disk.
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- When using [proximity placement groups (PPG)](../articles/virtual-machines/windows/proximity-placement-groups.md), all virtual machines sharing a disk must be part of the same PPG.
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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](/windows-server/failover-clustering/clustering-requirements).
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- Azure Site Recovery support isn't yet available.
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- Can only be enabled on data disks, not OS disks.
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- Host caching isn't available for standard SSDs with `maxShares>1`.
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- When using Availability sets and virtual machine scale sets with Azure shared disks, [storage fault domain alignment](../articles/virtual-machines/availability.md) with virtual machine fault domain isn't enforced for the shared data disk.
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- When using Availability sets and Virtual Machine Scale Sets with Azure shared disks, [storage fault domain alignment](../articles/virtual-machines/availability.md) with virtual machine fault domain isn't enforced for the shared data disk.
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- When using [proximity placement groups (PPG)](../articles/virtual-machines/windows/proximity-placement-groups.md), all virtual machines sharing a disk must be part of the same PPG.
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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](/windows-server/failover-clustering/clustering-requirements).
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- Azure Site Recovery support isn't yet available.
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- Azure Backup is available through [Azure Disk Backup](../articles/backup/disk-backup-overview.md).
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- Only [server-side encryption](../articles/virtual-machines/disk-encryption.md) is supported, [Azure Disk Encryption](../articles/virtual-machines/windows/disk-encryption-overview.md) isn't currently supported.
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- Can only be shared across availability zones if using [Zone-redundant storage for managed disks](../articles/virtual-machines/disks-redundancy.md#zone-redundant-storage-for-managed-disks).
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- Can only be shared across availability zones if using [Zone-redundant storage for managed disks](../articles/virtual-machines/disks-redundancy.md#zone-redundant-storage-for-managed-disks).
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