Performance Density – A New Metric for Rack-Scale Design

I’m constantly amazed by the specsmanship of the data storage industry.  Every month we hear about some new system that can achieve a gazillion IOPS or store 100’s of petabytes.  We revel in our own glory, often without consideration of the consequences.  Current examples are NVMe All-Flash Array and Software-Defined Storage (SDS) marketeers running amok.   Our industry is consistently rewarded for storage capacity density. This is the number of TBs that can be crammed into a shelf or rack unit (RU).  It is why drive makers constantly increase capacities for every form factor and Big Storage is cleverly stuffing as many drives as possible…