Azure Redis cache upgrade will data be loss during upgrade?

Hi @Oscar Thank you for posting your Question on Microsoft Q&A and for using Azure services.

In my understanding you are looking to upgrade your existing instance to accommodate more load for your Redis cache and wanted to know if there's are risk of data loss during upgrade. Please let me know if my understanding is not correct.

In response to your question, as long as the cache isn’t heavily loaded, there’s very little risk of downtime or data loss.

When you scale to a pricing tier with a lower databases limit than the current tier:
If you're using the default number of databases, which is 16 for all pricing tiers, no data is lost.
If you're using a custom number of databases that falls within the limits for the tier to which you're scaling, this databases setting is kept, and no data is lost.
If you're using a custom number of databases that exceeds the limits of the new tier, the databases setting is lowered to the limits of the new tier and all data in the removed databases is lost.
When you scale to a pricing tier with the same or higher databases limit than the current tier, your databases setting is kept, and no data is lost.

For more details please check the below docs

https://video2.skills-academy.com/en-us/azure/azure-cache-for-redis/cache-how-to-scale
https://video2.skills-academy.com/en-us/azure/azure-cache-for-redis/cache-best-practices-scale

Please do let us know if that answer your question. If that answer your question, please mark as accept answer.

Regards,
Oury