Managed Service for PostgreSQL cluster switches to the Unknown state immediately after creation
Issue description
Trying to create a cluster with the b1.nano host class fails, and the cluster switches to the Unknown status.
Solution
It may take a long time to deploy a cluster with this host type. This is because of too low a percentage of guaranteed CPU uptime: 5% for b1.nano.
Clusters with this host type have two vCPUs with the guaranteed uptime of 5% and 2 GB RAM.
We cannot consistently forecast the behavior for the guaranteed CPU uptime of less than 50%. Generally speaking, creating clusters with b1.nano host classes is a longer process because of limited resources used for deploying components to the hosts.
When creating your clusters, better select more powerful configurations with CPU uptime of more than 50%, for example, c3-c2-m4.
Alert
The b1.nano host class is being phased out.
You will not be able to create a new cluster with this host class.
For an up-to-date list of host classes, see the documentation section.