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Hello.
The number of AZs used can be reduced by deleting the Aurora Serverless instances running in AZs that are not used and deleting subnets of unnecessary AZs from the subnet group used by Aurora Serverless.
https://repost.aws/knowledge-center/rds-db-subnet-group
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I misunderstood the meaning of Multi-AZ. I supposed each instance has x 3 clone !
Using one AZ per instance. One instance will never use 3 AZs. You can check the AZ used by the instance from the RDS database screen.
Aurora Storage (i.e., "cluster storage volume" with the data) has 6 copies of all your data, 2 full copies in each of 3 AZs. This is not configurable and cannot be changed. Since you only pay for a single copy (GB/month), this should not really matter to you but it forms the basis for our durability and available of the Aurora system. You can decide how many compute "instances", which run the database engine, are needed to provide your applications with the level of performance and multi-user concurrency needed for your workloads.