Competitive in this space is also SeaweedFS, which I've taken out for a local spin. It feels kindof like "memcached-for-fs/s3"... you add 30GB chunks of storag

Competitive in this space is also SeaweedFS, which I've taken out for a local spin. It feels kindof like "memcached-for-fs/s3"... you add 30GB chunks of storage and it coalesces them for you without much ceremony. ~20 bytes storage overhead per file and performance seems pretty decent.