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As documented, 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.
answered a year ago
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It would be good to increase it just in case.
If a disk becomes unavailable, applications using RDS will be affected.
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Actually we are getting disk threshold alert not the disk usage alert. Hope you have storage autos along enabled with your rds, Rds increments by 10% of the allocated storage, your storage auto scaling threshold is now less the 10% To stop the alert increase your disk auto scaling threshold