alt Hacker NewsVersity Gateway looks like a reasonable option here. I haven't personally used it, but I know some folks who say it performs pretty great as a "ZFS-backed S3" alternative.
https://github.com/versity/versitygw
Unlike other options like Garage or Minio, it doesn't have any clustering, replication, erasure coding, ...
Your S3 objects are just files on disk, and Versity exposes it. I gather it exists to provide an S3 interface on top of their other project (ScoutFS), but it seems like it should work on any old filesystem.
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I really like what I've (just now) read about Versity. I like that they are thinking about large scale deployments with tape as the explicit cold-storage option. It really makes sense to me coming from an HPC background.
Thanks for posting this, as it's the first I've come across their work.
Garage also decide to not implement erasure coding.
Versity is really promising. I got a chance to meet with Ben recently at the Super Computing conference in St. Louis and he was super chill about stuff. Big shout out to him.
He also mentioned that the minio-to-versity migration is a straight forward process. Apparently, you just read the data from mino's shadow filesystem and set it as an extended attribute in your file.