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Merge pull request #18166 from LouisBerner/v-loberner-ado-437341-may-freshness
May freshness updates.
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azure-stack/operator/azure-site-recovery-capacity-planning.md

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@@ -4,7 +4,7 @@ description: Learn about capacity planning for Azure Site Recovery.
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author: ronmiab
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ms.author: robess
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ms.topic: conceptual
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ms.date: 08/12/2024
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ms.date: 06/10/2025
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ms.reviewer: rtiberiu
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ms.lastreviewed: 04/15/2024
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---
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Installation of Azure Site Recovery on Azure Stack Hub requires that you install the Site Recovery Resource Provider (RP).
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> [!NOTE]
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> With Microsoft.SiteRecovery-1.2301.2216.2287, Azure Site Recovery on Azure Stack Hub does not require Event Hubs as a dependency.
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> With Microsoft.SiteRecovery-1.2301.2216.2287, Azure Site Recovery on Azure Stack Hub doesn't require Event Hubs as a dependency.
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:::image type="content" source="../operator/media/azure-site-recovery/capacity-planning/three-services.png" alt-text="Screenshot of the three services to install Azure Site Recovery on Azure Stack Hub."lightbox="media/azure-site-recovery/capacity-planning/three-services.png":::
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For the scope of Azure Site Recovery on Azure Stack Hub, here's a starting point for calculations, especially for the cache storage account used:
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1. If there's a failover, during normal operations, multiply the number of disks replicated by the average RPO. For example, you might have (2MB * 250s). The cache storage account is normally a few KB to 500 MB per disk.
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1. If there's a failover, during normal operations, multiply the number of disks replicated by the average RPO. For example, you might have (2 MB * 250 s). The cache storage account is normally a few KB to 500 MB per disk.
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2. If there's a failover, given a worst case scenario, multiply the number of disks replicated by the average RPO over a full day.
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|16 |32 MB/s |4096 | |
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> [!NOTE]
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> 8Kb is the smallest block size of data Azure Site Recovery supports. Any changes less than 8Kb are treated as 8Kb.
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> 8 Kb is the smallest block size of data Azure Site Recovery supports. Any changes less than 8 Kb are treated as 8 Kb.
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To test further, we generated a consistent type of workload; for example, consistent storage changes in blocks of 8 Kb that total up to 1 MB/s per disk. This scenario isn't likely in a real workload, given that changes can happen at various times of the day, or in spikes of various sizes.
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To replicate these random patterns, we've also tested scenarios with:
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To replicate these random patterns, we also tested scenarios with:
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- 120 VMs (80 Windows, 40 Linux) protected through the same Azure Site Recovery VM appliance.
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- Each VM generating at random intervals, at least twice per hour, random blocks totaling 5 Gb of data across five files.

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