Redis is not scaling up

Question

I am trying to move my redis environment from C3 to C4 to have more capacity. I use the scale menu, I dont get any errors but the Redis instance doesnt show the new upgrade.

Answer 1

Hi Pablo Gil,
Thankyou for Reaching microsoft Q&A!
When scaling Azure Cache for Redis from C3 to C4, the operation runs asynchronously in the backend. In some cases, the Azure portal continues to show the original SKU even though the scale action was accepted.

Please check the Activity Log for the Redis resource and confirm that the scale operation has completed successfully. If it is still in progress, the SKU will not update until the operation fully finishes.

If the Activity Log shows the operation as succeeded but the cache still displays C3, perform a restart of the Redis instance. This does not change data persistence but forces the service to refresh the cache metadata and typically updates the SKU in the portal.

Also ensure there are no active maintenance or patching operations on the cache, as these can delay SKU updates.

Once the backend operation completes and the service refreshes, the cache will reflect the new C4 capacity automatically.

Answer 2

If your Redis instance is not reflecting the upgrade after attempting to scale from C3 to C4, consider the following points:

1. Scaling Operations: Ensure that you are following the correct steps to scale your Azure Cache for Redis instance. You should select the appropriate cache type and save your changes. If you are using the Enterprise or Enterprise Flash tiers, remember that you can only scale up and out, not down or in.
2. Scaling Notifications: Check for any notifications in the Azure portal that indicate the scaling process is underway. Sometimes, the scaling may take a little time to complete, and the status should change from "Scaling" to "Running" once it is done.
3. Capacity Increments: When scaling out, remember that capacity increases in increments of two. Ensure that you are increasing the capacity correctly.
4. Refresh the Portal: Sometimes, the Azure portal may not refresh automatically. Try refreshing the portal or logging out and back in to see if the changes appear.

If you have verified these steps and the issue persists, consider checking for any underlying issues or contacting Azure support for further assistance.

---

References:

• Scale an Azure Cache for Redis instance
• How to scale up and out - Enterprise and Enterprise Flash tiers