We have a project for which S3 is a perfect fit, but for some customers we need to run everything in house. Ideally, we'd run something such that little or none of the code needs to change; can anyone suggest such a system?
I'm particularly interested in stability experiences, as we have (slightly) more interest in stability than speed.
So far I've seen OpenStack's SWIFT, and Eucalyptus, and maybe Riak? as serious contenders here, but I've bene hard pressed to find user impressions in a production environment.