Simply wanted to add to Avi's comment about how to obtain this information from Unisphere Analyzer.  There is a great series on using Analyzer and also goes into generating useful Excel graphs from the exported data; however, specific to this thread is a quick walk-through that, in the author's own word's, demonstrates "... how to tease FASTCache performance data out of Analyzer."  [URL]   Also, just wanted to make a small (but subtle) correction to a comment made above about FAST Cache.  From the selected drives, it actually creates private RAID 1 rg's (and not RAID 10).
Friends,  I 'm finally managing some real storage stuff again and one of the CX4's I have has FAST Cache on board ! I'm using Solarwinds Profiler and I must say it's a very good tool to get quick access to performance data,   but   I'd like to know if my FAST Cache is actually doing something. I can see the 2 SSD's perform  around 2500 IOps, but I'm not seeing a degradation in disk usage of the raid groups which are using FAST Cache. I'd expect the RGs that were very busy before to show a decrease in %utilization, but I don't see it.  Does anyone have experience with FAST Cache and how to measure the effectiveness of the SSDs. Customers would like to know what they're paying for and so do I.
How to review FAST Cache performance ?