I'd say it got about 5GB/day of mostly-sequential writes for a year, and I base that on absolutely no quantifiable data. It was used for lots of development; compiling stuff, running an IDE and browser in addition to the full stack of stuff in production. It had MySQL with a prod snapshot, RabbitMQ, a Django web app and a bunch of twisted services. The biggest writing culprits were restoring MySQL snapshots and ridiculously verbose logging from services.