There is also ObjectiveFS that supports FUSE and uses S3 for both data and metadata storage, so there is no need to run any metadata nodes. Using S3 instead of

There is also ObjectiveFS that supports FUSE and uses S3 for both data and metadata storage, so there is no need to run any metadata nodes. Using S3 instead of a separate database also allows scaling both data and metadata with the performance of the S3 object store.