I have described my efforts to optimize IRIS Mirror deployment in AWS ElasticContainer Service (ECS) in my prior article.
IRIS Mirror in the cloud (AWS) | InterSystems Developer Community | AWS
I have come to the opinion that IRIS Mirror is not as reliable as needed when deployed in ECS. The root of the problem is the fact that ECS randomly assigns one of the available IP addresses to each EC2 host or Fargate task it starts.
These get stored in iris.cpf file in MapMirrors section as shown here:
[MapMirrors.IRISMIRROR]
FAILOVER1=10.2ab.1cd.146,2188,,10.2ab.1cd.

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