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Source facts

\n

Spot Priority Mix is available for Flexible, not Uniform, scale sets. Its base count defines the standard-VM portion below the distribution threshold; the percentage setting applies to capacity above that base. Updating those settings does not immediately create, delete, or rebalance existing VMs. The new distribution is applied during subsequent scaling operations. Portal updates are limited to scale sets where the feature is already enabled. Microsoft Learn.

\n

Applicability

\n

Use this distinction when a saved policy and current instance inventory appear inconsistent. Record the total population, priority of each instance, and actual scaling events since the change. Do not infer a failed update simply because a static population still reflects the previous settings.

\n

DSE recommendation

\n

Separate acceptance of the saved mix policy from acceptance of its effect during an approved scale operation. Have the workload owner define the intended standard baseline and the distribution above it. Keep that design decision separate from any immediate need to restore application capacity. Avoid repeatedly editing the same percentage in an attempt to force an undocumented instant rebalance.

\n

Verification

\n

Confirm the saved policy first. Then, during an authorized scaling test, compare the before-and-after instance priorities and the operation result with the intended distribution. Record any eviction and distinguish running instances from the inventory being counted. If no qualifying scale operation has occurred, leave population convergence unverified rather than claiming either success or failure from the saved settings alone.

\n

Official references

\n

Microsoft Learn: Spot Priority Mix. Source reviewed September 9, 2026.

", "content_text": "Source facts\nSpot Priority Mix is available for Flexible, not Uniform, scale sets. Its base count defines the standard-VM portion below the distribution threshold; the percentage setting applies to capacity above that base. Updating those settings does not immediately create, delete, or rebalance existing VMs. The new distribution is applied during subsequent scaling operations. Portal updates are limited to scale sets where the feature is already enabled. Microsoft Learn.\nApplicability\nUse this distinction when a saved policy and current instance inventory appear inconsistent. Record the total population, priority of each instance, and actual scaling events since the change. Do not infer a failed update simply because a static population still reflects the previous settings.\nDSE recommendation\nSeparate acceptance of the saved mix policy from acceptance of its effect during an approved scale operation. Have the workload owner define the intended standard baseline and the distribution above it. Keep that design decision separate from any immediate need to restore application capacity. Avoid repeatedly editing the same percentage in an attempt to force an undocumented instant rebalance.\nVerification\nConfirm the saved policy first. Then, during an authorized scaling test, compare the before-and-after instance priorities and the operation result with the intended distribution. Record any eviction and distinguish running instances from the inventory being counted. If no qualifying scale operation has occurred, leave population convergence unverified rather than claiming either success or failure from the saved settings alone.\nOfficial references\nMicrosoft Learn: Spot Priority Mix. Source reviewed September 9, 2026.", "content_markdown": "## Source facts\n\nSpot Priority Mix is available for Flexible, not Uniform, scale sets. Its base count defines the standard-VM portion below the distribution threshold; the percentage setting applies to capacity above that base. Updating those settings does not immediately create, delete, or rebalance existing VMs. The new distribution is applied during subsequent scaling operations. Portal updates are limited to scale sets where the feature is already enabled. [Microsoft Learn](https://learn.microsoft.com/en-us/azure/virtual-machine-scale-sets/spot-priority-mix).\n\n## Applicability\n\nUse this distinction when a saved policy and current instance inventory appear inconsistent. Record the total population, priority of each instance, and actual scaling events since the change. Do not infer a failed update simply because a static population still reflects the previous settings.\n\n## DSE recommendation\n\nSeparate acceptance of the saved mix policy from acceptance of its effect during an approved scale operation. Have the workload owner define the intended standard baseline and the distribution above it. Keep that design decision separate from any immediate need to restore application capacity. Avoid repeatedly editing the same percentage in an attempt to force an undocumented instant rebalance.\n\n## Verification\n\nConfirm the saved policy first. Then, during an authorized scaling test, compare the before-and-after instance priorities and the operation result with the intended distribution. Record any eviction and distinguish running instances from the inventory being counted. If no qualifying scale operation has occurred, leave population convergence unverified rather than claiming either success or failure from the saved settings alone.\n\n## Official references\n\n[Microsoft Learn: Spot Priority Mix](https://learn.microsoft.com/en-us/azure/virtual-machine-scale-sets/spot-priority-mix). 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Its base count defines the standard-VM portion below the distribution threshold; the percentage setting applies to capacity above that base. Updating those settings does not immediately create, delete, or rebalance existing VMs. The new distribution is applied during subsequent scaling operations. Portal updates are limited to scale sets where the feature is already enabled. Microsoft Learn.\nApplicability\nUse this distinction when a saved policy and current instance inventory appear inconsistent. Record the total population, priority of each instance, and actual scaling events since the change. Do not infer a failed update simply because a static population still reflects the previous settings.\nDSE recommendation\nSeparate acceptance of the saved mix policy from acceptance of its effect during an approved scale operation. Have the workload owner define the intended standard baseline and the distribution above it. Keep that design decision separate from any immediate need to restore application capacity. Avoid repeatedly editing the same percentage in an attempt to force an undocumented instant rebalance.\nVerification\nConfirm the saved policy first. Then, during an authorized scaling test, compare the before-and-after instance priorities and the operation result with the intended distribution. Record any eviction and distinguish running instances from the inventory being counted. If no qualifying scale operation has occurred, leave population convergence unverified rather than claiming either success or failure from the saved settings alone.\nOfficial references\nMicrosoft Learn: Spot Priority Mix. 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