More expensive is not always better Its always tempting when designing a technical architecture to think that more expensive is better particualry when buying hard disks.
The lure of a 15k RPM can seem appealing in terms of getting the required iOPs for your system.
What most people don’t realise though is that it can actually be more cost effective to get higher iOPs using 10k RPM disks. Not only that, but you get a load of extra storage to boot. I discovered this article recently which discusses how you can get much better value for your money by buying 10k disks and configuring them for an additional performance boost.