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articles/virtual-machines/disks-high-availability.md

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@@ -63,7 +63,7 @@ To deploy resources across availability zones, you can either use [zone-redundan
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[Virtual Machine Scale Sets](../virtual-machine-scale-sets/overview.md) let you create and manage a group of load balanced VMs. The number of VM instances can automatically adjust in response to demand or follow a schedule you define. A zone-redundant Virtual Machine Scale Set is a Virtual Machine Scale Set that has been deployed across multiple availability zones. See [Zone redundant or zone spanning](../virtual-machine-scale-sets/virtual-machine-scale-sets-use-availability-zones.md#zone-redundant-or-zone-spanning).
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With zone-redundant Virtual Machine Scale Sets using the flexible orchestration mode, VMs and their disks are replicated to one or more zones within the region they're deployed in to improve the resiliency and availability of your applications and data. This configuration spreads VMs across selected zones in a best effort approach by default but also provides the ability to specify strict zone balance in the deployment.
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With zone-redundant Virtual Machine Scale Sets using the flexible orchestration mode, VMs, and their disks are replicated to one or more zones within the region they're deployed in to improve the resiliency and availability of your applications and data. This configuration spreads VMs across selected zones in a best effort approach by default but also provides the ability to specify strict zone balance in the deployment.
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#### Deploy VMs and disks across three availability zones
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### Use ZRS disks when sharing disks between VMs
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You should use ZRS when sharing a disk between multiple VMs. If you use LRS, the shared disk becomes a single point of failure for your clustered application. This means that if your shared LRS disk experiences an outage, all the VMs to which this disk is attached will experience downtime. Using a ZRS disk mitigates this, since the disk's data will be in three different availability zones. To learn more about shared disks, see [Share an Azure managed disk](disks-shared.md).
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You should use ZRS when sharing a disk between multiple VMs. If you use LRS, the shared disk becomes a single point of failure for your clustered application. This means that if your shared LRS disk experiences an outage, all the VMs to which this disk is attached will experience downtime. Using a ZRS disk mitigates this, since the disk's data is in three different availability zones. To learn more about shared disks, see [Share an Azure managed disk](disks-shared.md).
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## Next steps
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