Have you tried running the equivalent of S3 using GlusterFS? Because I've seen mixed results with Gluster in practice and am not sure I'd feel comfortable going

Have you tried running the equivalent of S3 using GlusterFS? Because I've seen mixed results with Gluster in practice and am not sure I'd feel comfortable going that route. Also, which one of their staff would have had to learn how to scale that? How many mistakes would they have made along the way and how much would that have cost them?