RDS Storage size is approaching the maximum storage threshold.

Question

I've subscribed to RDS events and I'm constantly getting the following event from one of my databases:

**Storage size  is approaching the maximum storage threshold . Increase the maximum storage threshold.**

Observations:
*  In the past the instance has been full to 90% of disk capacity
* Currently **Free Storage Space** metric indicates that 75% of the disk is free.
* Couple of days have passed since we freed disk space on the instance.
* Data growth is very slow

Answer

As [documented](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PIOPS.StorageTypes.html#USER_PIOPS.Autoscaling), to stop the alert, you will need to set the maximum storage threshold to at least 26% more than the allocated storage.

> For example, if you have DB instance with 1000 GiB of allocated storage, then set the maximum storage threshold to at least 1100 GiB. If you don't, you get an error such as Invalid max storage size for engine_name. However, we recommend that you set the maximum storage threshold to at least 1260 GiB to avoid the event notification.

Answer

You may want to consider using [RDS storage auto scaling](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PIOPS.StorageTypes.html#USER_PIOPS.Autoscaling).

Answer

It would be good to increase it just in case.  
If a disk becomes unavailable, applications using RDS will be affected.

RDS Storage size is approaching the maximum storage threshold.

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