I realize the OS is only a small part of the datacenter, but it's most of RHT's business, so that's what I focused on. > I can't quite speak for HP-UX, but Sol

I realize the OS is only a small part of the datacenter, but it's most of RHT's business, so that's what I focused on. > I can't quite speak for HP-UX, but Solaris and AIX are definitely not dead platforms. My main claim is that "Big Iron" is going to outlive RedHat in the application platform category. I have a hard time seeing big iron becoming anything other than the open systems equivalent of legacy mainframe. Bear in mind that kernel interfaces aren't purely about hardware - it's about repeatable, predictable performance and behavior profiles. Watch a bunch of bank server platform engineers lose their shit when memory performance under pressure changes after a kernel patch. And remember that in the traditional enterprise, it's not just about stripping down the OS, it's about all of the other tools that get used for performance, security, backup, monitoring, remote execution, change management, privilege escalation. I actually am working on some research on things like LXC at my day job, and one of the challenges is that containers are great until you want to run a bunch of stuff inside the container. And my vantage point was at one time databases, and that's still the market segment I know the best. But I work on everything server and cloud-related, so most customers I talk to are just traditional enterprises.