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Storage Quality of Service (QoS) Policies help you manage storage I/O performance by setting both a minimum and a maximum number of IOPS (Input/Output Operations Per Second) for virtual hard disks and Azure managed disks. These policies keep throughput consistent even when workloads vary, so critical VMs get the performance they need while no single VM can overwhelm the storage system.
You can configure Storage QoS policies using two complementary strategies. The maximum IOPS (limit) caps the highest I/O rate a virtual disk can reach, preventing any one VM from hogging the shared storage resources. The minimum IOPS (reservation) guarantees a baseline level of performance for important workloads, and those VMs can burst above the reservation if spare bandwidth is available. Together, these two settings give you both a floor and a ceiling for storage performance.
Storage QoS policies can be assigned at two levels. At the host level, the policy applies uniformly to all VMs running on that host, which ensures fairness across the whole server. At the guest level, the policy targets a specific VM, so you can give individual workloads a customized performance level based on their importance. The choice between host and guest assignment depends on whether you want system-wide fairness or per-workload control.
To make sure QoS policies are actually being enforced and meeting performance targets, you need to track compliance. You can use PowerShell cmdlets to create and manage policies programmatically. Performance Monitor gives you real-time IOPS and bandwidth usage on the server. For a cloud-aware view, Azure Monitor metrics provide detailed insights and let you set alerts when IOPS or bandwidth approaches the defined thresholds. By combining these tools, you can verify that your storage QoS policies are working as intended and adjust them when workloads change.
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