Mac Pro owner crafts an example Fusion Drive, shows the fearless how it's done -- Engadget

Mac fans not keen on picking up a new iMac to get that best-of-all-worlds Fusion Drive might not have to consider a full-on system swap if they’re brave enough. Knowing how Apple’s approach unites an SSD and a spinning hard drive in a single logical volume, developer Patrick Stein has used command line code to do just that inside his Mac Pro and prove that it works. His series of experiments with organized data shows the effect on storage speeds and that the pseudo-Fusion should even work with less common ZFS formatting. The publicly available instructions could well be tempting to Mac fans who want speed and storage all at once, although we might personally take a pass -- there’s more than a fair share of risk in using an unofficial hack to recreate a storage technique that Apple hasn’t even shipped.