Breaking Down Microsoft Azure: Security with Geo Redundancy
When entire Azure regions or data centers experience downtime, it is critical for compute to continue processing in a different region. Geo redundancy signifies a computer system operating at two or more geographical locations as duplication in case the primary system fails due to any reason.
Azure Functions run in a specific region. To get higher availability, you can deploy the same functions to multiple regions. When in multiple regions you can have your functions running in the active/active pattern or active/passive pattern.azure go
- Active/active. Both regions are active and receiving events (duplicate or rotational). Active/active is recommended for HTTPs functions in combination with Azure Front Door.
- Active/passive. One region is active and receiving events, while a secondary is idle. When failover is required, the secondary region is activated and takes over processing. This is recommended for non-HTTP functions like Service Bus and Event Hubs.
Geo redundant storage (GRS) is designed to provide at least 99.99% durability of objects over a given year by replicating your data to a secondary region that is hundreds of miles away from the primary region. If your storage account has GRS enabled, then your data is durable even in the case of a complete regional outage or a disaster in which the primary region is not recoverable. For a storage account with GRS enabled, an update is first committed to the primary region. Then the updated is replicated asynchronously to the secondary region, where it is also replicated.
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