Why not flash?

                                       

Why are enterprise IT shops still not using more flash storage? Many of these reasons reasons are historical as flash storage is relatively new in the very conservative, slow moving world or enterprise IT everything takes a long time and enterprise storage arrays are very expensive.

Yet now there is no reason not to investigate flash based storage solutions. Virtually every database benchmark in recent years from the Transaction Processing Performance Council has been based on flash storage. The benchmarks measure database transaction processing performance and cost per transaction. The vendors only use flash storage because it provides the lowest cost per transaction, so if high performance, low cost is important then enterprise IT shops should use the benchmark results as a blueprint.

All major system resources have had huge increase in performance over the last decade, yet old mechanical HDD have not kept pace:
                        

So the question is why are enterprise IT shops still using spinning rust?

See benchmarks for details:
http://www.tpc.org/tpcc/results/tpcc_last_ten_results.asp
http://www.tpc.org/tpce/results/tpce_last_ten_results.asp