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

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@@ -18,7 +18,7 @@ Azure offers several configuration options for ensuring high availability of Azu
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|[Applications running on a single VM](#recommendations-for-applications-running-on-a-single-vm) |[Use Ultra Disks, Premium SSD v2, and Premium SSD disks](#use-ultra-disks-premium-ssd-v2-or-premium-ssd). |Single VMs using only Ultra Disks, Premium SSD v2, or Premium SSD disks have the highest uptime service level agreement (SLA), and these disk types offer the best performance. |
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| |[Use zone-redundant storage (ZRS) disks](#use-zone-redundant-storage-disks). |Access to your data even if an entire zone experiences an outage. |
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|[Applications running on multiple VMs](#recommendations-for-applications-running-on-multiple-vms) |Deploy VMs and disks across multiple availability zones using a [zone redundant Virtual Machine Scale Set with flexible orchestration mode](#use-zone-redundant-virtual-machine-scale-sets-with-flexible-orchestration) or by deploying VMs and disks across [three availability zones](#deploy-vms-and-disks-across-three-availability-zones). |Multiple VMs have the highest uptime SLA when deployed across multiple zones. |
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|[Applications running on multiple VMs](#recommendations-for-applications-running-on-multiple-vms) |Distribute VMs and disks across multiple availability zones using a [zone redundant Virtual Machine Scale Set with flexible orchestration mode](#use-zone-redundant-virtual-machine-scale-sets-with-flexible-orchestration) or by deploying VMs and disks across [three availability zones](#deploy-vms-and-disks-across-three-availability-zones). |Multiple VMs have the highest uptime SLA when deployed across multiple zones. |
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| |Deploy VMs and disks across multiple fault domains with either [regional Virtual Machine Scale Sets with flexible orchestration mode](#use-regional-virtual-machine-scale-sets-with-flexible-orchestration) or [availability sets](#use-availability-sets). |Multiple VMs have the second highest uptime SLA when deployed across fault domains. |
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| |[Use ZRS disks when sharing disks between VMs](#use-zrs-disks-when-sharing-disks-between-vms). |Prevents a shared disk from becoming a single point of failure. |
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Availability zones are separated groups of data centers within a region that have independent power, cooling, and networking infrastructure. They're close enough to have low-latency connections to other availability zones but far enough to reduce the possibility that more than one is affected by local outages or weather. See [What are availability zones?](../reliability/availability-zones-overview.md) for details.
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Multiple VMs have the highest [SLA](https://www.microsoft.com/licensing/docs/view/Service-Level-Agreements-SLA-for-Online-Services?lang=1) when deployed across three availability zones. For VMs and disks deployed across multiple availability zones, the disks and their parent VMs are respectively collocated in the same zone, which prevents multiple VMs from going down even if an entire zone experiences an outage. Availability zones aren't currently available in every region, see [Azure regions with availability zone support](../reliability/availability-zones-service-support.md#azure-regions-with-availability-zone-support).
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Multiple VMs have the highest [SLA](https://www.microsoft.com/licensing/docs/view/Service-Level-Agreements-SLA-for-Online-Services?lang=1) when distributed across three availability zones. For VMs and disks distributed across multiple availability zones, the disks and their parent VMs are respectively collocated in the same zone, which prevents multiple VMs from going down even if an entire zone experiences an outage. Availability zones aren't currently available in every region, see [Azure regions with availability zone support](../reliability/availability-zones-service-support.md#azure-regions-with-availability-zone-support).
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VMs deployed across multiple availability zones may have higher network latency than VMs deployed in a single availability zone, which could be a concern for workloads that require ultra-low latency. If low latency is your top priority, consider the methods described in [Deploy VMs and disks across multiple fault domains](#deploy-vms-and-disks-across-multiple-fault-domains).
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VMs distributed across multiple availability zones may have higher network latency than VMs distributed in a single availability zone, which could be a concern for workloads that require ultra-low latency. If low latency is your top priority, consider the methods described in [Deploy VMs and disks across multiple fault domains](#deploy-vms-and-disks-across-multiple-fault-domains).
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To deploy resources across availability zones, you can either use [zone-redundant Virtual Machine Scale Sets](#use-zone-redundant-virtual-machine-scale-sets-with-flexible-orchestration) or [deploy resources across availability zones](#deploy-vms-and-disks-across-three-availability-zones).
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