It's hard to define "best", and in many cases, the answers to these questions depend heavily on the workload and the caching parameters (how long do we wait bef

It's hard to define "best", and in many cases, the answers to these questions depend heavily on the workload and the caching parameters (how long do we wait before flushing to S3, etc). We are designed to provide good file system performance, even if customers are repeatedly writing small pieces of data to a 1 GiB file, so "best" in this case is a question of whether or not it's cost efficient.