A lot of them actually. Ceph personally I've used. But there's a ton, some open source, some paid. Backblaze has a product Buckets or something. Dell powerscale. Cloudian has one. Nutanix has one.
I've been looking at microceph, but the requirement to run 3 OSDs on loopback files plus this comment from the docs gives me pause:
`Be wary that an OSD, whether based on a physical device or a file, is resource intensive.`
Can anyone quantify "resource intensive" here? Is it "takes an entire Raspberry Pi to run the minimum set" or is it "takes 4 cores per OSD"?
Edit: This is the specific doc page https://canonical-microceph.readthedocs-hosted.com/stable/ho...
ceph depends a lot on your use case
minio was also suited for some smaller use cases (e.g. running a partial S3 compatible storage for integration tests). Ceph isn't really good for it.
But if you ran large minio clusters in production ceph might be a very good alternative.
Ceph is awesome for software defined storage where you have multiple storage nodes and multiple storage devices on each. It's way too heavy and resource intensive for a single machine with loopback devices.