Azure Redis Cache Reservations

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Source for automated Recommendations: Spend data in the CloudZero platform. Frequency: Checked once per day. If the Recommendation is marked as Ignored, it will still be updated, but notifications will no longer be sent for any updates.

This Recommendation is created when there is pay-as-you-go spend for Azure Cache for Redis that could be covered by a reservation for compute resources. Learn more about these reservations in the Microsoft documentation.

Threshold: This Recommendation is created if using a reservation on pay-as-you-go Redis Cache will save at least $500 based on a 25% savings rate. When pay-as-you-go spend results in savings of less than $500, the Recommendation will automatically be closed.

Reservations work as follows:

The size of the reservation should be based on the total amount of memory used by the existing or soon-to-be-deployed cache within a specific region, and using the same service tier.
Premium and Enterprise Caches have two nodes by default, while Enterprise Flash has three nodes.
Reservations are sold in increments of nodes. Use the Azure Pricing Calculator to calculate the number of nodes needed based on the number of hours to cover with a reservation.

When you are purchasing a reservation in Azure, you must specify the following:

Subscription: Subscription used to pay for the Azure Cache for Redis reservation.
Scope: The reservation's scope can cover one subscription, multiple subscriptions (shared scope), a single resource group, or a management group.
Region: The Azure region that is covered by the capacity reservation.
*Pricing Tier: The service tier for the instances.
Term: 1 or 3 years.
*Quantity: The number of nodes to reserve in the selected Azure region and Pricing Tier.

Learn more about buying a reservation in the Microsoft documentation.

Analyze your usage information to help determine which reservations you should purchase. Learn more about how to determine the correct reservation size in the Microsoft documentation.

Note the following details:

Applicable Tiers: Reservations are only available for Premium, Enterprise, and Enterprise Flash Redis Cache tiers.
Reservation Flexibility: You can cancel, exchange, or refund reservations with certain limitations. Learn more in the Microsoft documentation.
Role Requirements: To buy a reservation, you must have the Owner role or Reservation Purchaser role on an Azure subscription.
Savings Calculation: The savings multiplier used to calculate the cost impact for this insight represents the savings achieved in applying a reservation to a non-Enterprise Account resource cost.

The 90-day cost graph shows the daily total spend for all instances with a Premium, Enterprise, or Enterprise Flash Redis Cache tier and highlights the top five resources with the highest spend to consider optimizing.