This helps servers in VDI (Virtual Desktop Infrastructure) environments to handle the humongous I/O needs. Lets try to picture this:
-In VDI environments, employees doen't have a desktop to access emails, do spreadsheets, feed databases or whatever. They have thin clients;
-Thin clients are devices that just connects your mouse, keyboard and monitor to the servers, which actually handles your desktop processing, storage and os;
-Why? Because this way users can access their desktops from anywhere they want in any devide they want, as the desktops are hosted in (generally) a cluster of servers. Plus, it makes management easier.
-Now imagine everyone arriving to work at morning. Hundreds of thousands of boot requests hammering the server cluster at the same time. Can you imagine the load on the storage system?
Search also for FusionIO...
And these puppies usually costs something like 20k plus