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ext4 on an mdadm raid. It works well enough, and supports growing your array.
Although if I rebuilt this from scratch, I would skip mdadm and just let minio control all the drives. Minio has an S3 compatible API, which I'd then mount into whatever apps need it.
Love MinIO but it’s not a filesystem and mounting object storage as a filesystem is not a great experience (speaking from commercial experience).
Same experience here. S3 is essentially a key/value store to simply put and retrieve large values/blobs. Everything resembling filesystem features is just convention over how keys are named. Comminication uses HTTP, so there is a lot of overhead when working with it as an FS.
In the web you can use these properties to your advantage: you can talk to S3 with simple HTTP clients, you can use reverse proxies, you can put a CDN in front and have a static file server.
But FS utils are almost always optimized for instant block based access and fast metadata responses. Something simple like a
findwill fuck you over with S3.
Love mdadm, it's simple and straightforward.