[sintaks]

That would definitely be cool. Pretty unlikely, however. When it comes to hardware, they like to keep each service's resources separate. While a given box or rack many handle many internal services, they're usually centered around a particular public service. S3 has their racks, EC2 has theirs, etc. Beyond the obvious benefit of determinism - knowing S3 traffic won't impact Glacier's hardware life, being able to plan for peak for a given service, etc - I'm guessing there are also internal business reasons. Keeping each service's resources separate allows them to audit costs from both internal and external customers.

Then there's failure conditions. EBS is an S3 customer. Glacier is an S3 customer. Some amount of isolation is desirable. If a bad code checkin from an S3 engineer causes a systemic error that takes down a DC, it would be nice if only S3 were impacted.

I probably shouldn't go into the hardware design (because 1) I'm not an expert and 2) I don't think they've given any public talks on it), but it's some of the cooler stuff I've seen, especially when it came to temperature control.