Ray Lucchesi from RayOnStorage Blog comments:

Attended SNW USA a couple of weeks ago and talked with Irfan Ahmad, Founder/CTO of  CloudPhysics, a new Management-as-a-Service offering for VMware. He took out a chart which I found very interesting which I reproduce below as my Chart of the Month for October.

A picture is worth a thousand words. Ray’s chart is worth around 1,300. There’s a great bit of analysis as to the exact point where SSD caching makes sense.

Read more at: VM working set inflection points & SSD caching — chart-of-the-month