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# Deploy a managed disk that uses zone-redundant storage (preview)
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# Deploy a managed disk that uses zone-redundant storage
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This article covers how to deploy a disk that uses zone-redundant storage (ZRS) as a redundancy option (preview). ZRS replicates your Azure managed disk synchronously across three Azure availability zones in the selected region. Each availability zone is a separate physical location with independent power, cooling, and networking.
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This article covers how to deploy a disk that uses zone-redundant storage (ZRS) as a redundancy option. ZRS replicates your Azure managed disk synchronously across three Azure availability zones in the selected region. Each availability zone is a separate physical location with independent power, cooling, and networking.
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For conceptual information on ZRS, see [Zone-redundant storage for managed disks (preview)](disks-redundancy.md#zone-redundant-storage-for-managed-disks-preview)
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For conceptual information on ZRS, see [Zone-redundant storage for managed disks](disks-redundancy.md#zone-redundant-storage-for-managed-disks)
**Applies to:**:heavy_check_mark: Linux VMs :heavy_check_mark: Windows VMs :heavy_check_mark: Flexible scale sets :heavy_check_mark: Uniform scale sets
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Azure managed disks offer two storage redundancy options, zone-redundant storage (ZRS) as a preview, and locally-redundant storage. ZRS provides higher availability for managed disks than locally-redundant storage (LRS) does. However, the write latency for LRS disks is better than ZRS disks because LRS disks synchronously write data to three copies in a single data center.
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Azure managed disks offer two storage redundancy options, zone-redundant storage (ZRS), and locally-redundant storage. ZRS provides higher availability for managed disks than locally-redundant storage (LRS) does. However, the write latency for LRS disks is better than ZRS disks because LRS disks synchronously write data to three copies in a single data center.
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## Locally-redundant storage for managed disks
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If your workflow doesn't support application-level synchronous writes across zones, or your application must meet zero RPO, then ZRS disks would ideal.
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## Zone-redundant storage for managed disks (preview)
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## Zone-redundant storage for managed disks
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Zone-redundant storage (ZRS) synchronously replicates your Azure managed disk across three Azure availability zones in the region you select. Each availability zone is a separate physical location with independent power, cooling, and networking.
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A ZRS disk (preview) lets you recover from failures in availability zones. If a zone went down, a ZRS disk can be attached to a virtual machine (VM) in a different zone. ZRS disks can also be shared between VMs for improved availability with clustered or distributed applications like SQL FCI, SAP ASCS/SCS, or GFS2. A shared ZRS disk can be attached to primary and secondary VMs in different zones to take advantage of both ZRS and [availability zones](../availability-zones/az-overview.md). If your primary zone fails, you can quickly fail over to the secondary VM using [SCSI persistent reservation](disks-shared-enable.md#supported-scsi-pr-commands).
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A ZRS disk lets you recover from failures in availability zones. If a zone went down, a ZRS disk can be attached to a virtual machine (VM) in a different zone. ZRS disks can also be shared between VMs for improved availability with clustered or distributed applications like SQL FCI, SAP ASCS/SCS, or GFS2. A shared ZRS disk can be attached to primary and secondary VMs in different zones to take advantage of both ZRS and [availability zones](../availability-zones/az-overview.md). If your primary zone fails, you can quickly fail over to the secondary VM using [SCSI persistent reservation](disks-shared-enable.md#supported-scsi-pr-commands).
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The Azure VM Image Builder service doesn't store/process customer data outside regions that have strict single region data residency requirements when a customer requests a build in that region. In the event of a service outage for regions that have data residency requirements, you will need to create templates in a different region and geography.
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### Zone Redundancy
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Distribution supports zone redundancy, VHDs are distributed to a Zone Redundant Storage account by default and the Shared Image Gallery version will support a [ZRS storage type](../disks-redundancy.md#zone-redundant-storage-for-managed-disks-preview) if specified.
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Distribution supports zone redundancy, VHDs are distributed to a Zone Redundant Storage account by default and the Shared Image Gallery version will support a [ZRS storage type](../disks-redundancy.md#zone-redundant-storage-for-managed-disks) if specified.
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