Azure Cache check number of replicas

Question

Question 1:

I have just subscribed a Azure Cache for Redis, and I upgraded it from standard C1 into premium P1. However, it doesn't prompt me to select the number of replicas.

When I check the overview later, it shows as Zone-redundant. However its not showing the number of replicas it has. It's there a way to check the number of replicas?

Question 2:

Refer to this link https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-whats-new. It's mentioned that the Standard Tier now will have the zone-redundant by default.

Hence I would like the confirm that has it been applied to all regions? or at least to the West Europe region? And can I confirm is it a 3 replicas across 3 zones by default here?

Answer 1

Hi @John Wong Yek Hon,

Welcome to the Microsoft Q&A Platform! Thank you for asking your question here.

As we understand that, you have upgraded your Azure Cache for Redis from Standard C1 to Premium P1, but you are not able to see the number of replicas that are being used.

Regarding your question about the number of replicas and zone redundancy, I would like to clarify that for the Premium tier, Azure Cache for Redis now creates caches with zone redundancy by default using Automatic_Zonal_Allocation in all regions that support zones. This means that the cache will be replicated across multiple availability zones to provide high availability and fault tolerance.

To check the number of replicas that are being used for your cache, you can use the Azure Portal. Here are the steps:

1. Go to the Azure Portal and navigate to your Azure Cache for Redis instance.
2. Click on the "Overview" tab and look for the "Replication" section.
3. In the "Replication" section, you should see the number of replicas that are being used for your cache.

Regarding your question about the number of replicas and availability zones, the default configuration for Premium caches is to use three replicas across three zones. However, you can choose to manually select availability zones or choose not to use zone redundancy if you prefer.

Your upgraded Premium P1 cache in the West Europe region is configured with zone redundancy by default, utilizing Automatic Zonal Allocation. This setup includes a primary node and one replica, distributed across different availability zones to ensure high availability. If you require a different configuration, such as additional replicas, you would need to create a new cache instance with the desired settings, as certain features, including the number of replicas, cannot be modified after the cache is created.

Please refer to the below mentioned links for more information.

https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-how-to-zone-redundancy

https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-how-to-multi-replicas

https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-how-to-scale?utm_source=chatgpt.com&tabs=scale-up-and-down-with-basic-standard-and-premium

https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-high-availability#regional-availability

I hope this information helps. Please do let us know if you have any further queries.

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