When you upload your site on several instances in Azure or want to scale the instances, you need to prepare the communication infrastructure to transmit messages between the nodes. For example, to communicate cache invalidation. Sitefinity CMS uses Redis message sender that you must configure for NLB communication in Azure Web Apps.
NOTE: In Sitefinity CMS Redis Cache is used for NLB communication only. It is not used for persisting items in cache.
Perform the following:
NOTE: Because Redis Cache is not used for storing cache data, but for NLB communication only, Sitefinity CMS can work with the minimum pricing tier for Azure Redis – Basic tier for development purposes. If you want to achieve failover redundancy for a production environment, we recommend using at least Azure Standard Pricing tier (C0+). For more information about the different pricing tires, see Redis Cache Pricing.
NOTE: Sitefinity CMS and Redis are completely decoupled and they can work both (or one of them) on-premises infrastructure.
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