An overview of single-purpose Linux distributions 3 years ago
Its paid SW, but I like Unraid OS for this. It supports Dockers, VMS, and of course an easy to manage hard drive array with parity and ssd caching support. Just being able to chuck all your old drives that are laying around, add them to the pool and bring new life to old HW was worth it for me. The docker and VM support are nice extras.