[neepi]

Probably AWS issue. Our production RDS postgres cluster did that a few months back. Just stopped responding on the network. Health checks were fine. AWS support was mostly useless and couldn't work it out in an hour, despite having their top tier enterprise support, so with customers down we had to create a whole new cluster and do a restore from backup which took 4 hours.

RDS is now gone. It's on a couple of EC2 instances with replication, hourly EBS snapshots and daily shipping to S3.

I'm loathed to use AWS's "encapsulated" services for anything since.

[Aeolun]

I think these are isolated incidents though. We’ve ran several tens of RDS clusters for 6 years running, and nothing has ever gone wrong. Maybe the ap-northeast-1 region is well maintained?