Hi, I understand your RDS instance is stuck in rebooting and not accepting connections and you'd like to know how this can be mitigated. From your response, I see that your RDS ran out of storage. Please note that when RDS runs out of storage, connections will not be possible. You then increased storage and RDS instance was in "storage optimization" mode. As per document here [1], "storage optimization" does not prevent connection. It only prevents further storage modification actions within the next 6 hours. The connection issue could be due to the persistence in low storage available. You then tried to reboot the RDS but it is stuck in rebooting. Please note that the reboot process will not complete when the RDS does not have storage available. As you mentioned that the only option you see is "Delete", you can either perform the either of the below mitigative steps:

• Contact AWS Premium Support [2] in order to get engineers an internal look at the RDS
• Or Delete the RDS. Ensure to check if you have a manual backup and restore it. I hope the above information is helpful.

Reference links:

[1]: Working with storage for Amazon RDS DB instances - Increasing DB instance storage capacity - https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PIOPS.StorageTypes.html#USER_PIOPS.ModifyingExisting [2]: https://aws.amazon.com/premiumsupport/plans/