Yes, you could do that. Multiple images, actually. And that's basically what these servers do automatically. There are 4 levels of cache, main memory (which is RAID-protected actually, called RAIM -- only IBM does that), and there's another optional level of directly processor-addressable memory called Flash Express which is nonvolatile -- that's new, too. It works particularly well for fast paging, in-memory databases, memory dumps, etc. Then you go into fiber-attached and heavily cached solid state disk, fast disk, nearline disk, tape libraries. There are a lot of storage layers, and they're all very big.