RDS allocated storage vs Max storage price

Hi Sanjeev,

The decision to set the allocated storage for your RDS instance depends on your specific requirements and the expected growth of your database.

Allocated Storage is the amount of storage that you provision for your RDS instance. It represents the initial amount of storage that is allocated to your database.
On the other hand, Max Storage Size is the maximum amount of storage that your database can automatically scale to, based on the allocated storage and the storage autoscaling settings.

If you have set the allocated storage to 100 GB and the max storage size to 150 GB, it means your database can automatically scale up to 150 GB if needed.
Keep in mind that provisioning more storage than you currently need may result in higher costs.

References:
[1] https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PIOPS.StorageTypes.html

Hope this answers your question.

Thanks,
Atul