DV4 tuned …

spent the weekend working on our DeltaV 4 unit, tuning it a bit. Previous write numbers were a bit lower than I liked.
So we adjusted some of the configuration a little. This is what resulted (old write numbers were in the 450MB/s region for this test)

Run status group 0 (all jobs):
  WRITE: io=31,748MB, aggrb=788MB/s, minb=807MB/s, maxb=807MB/s, mint=40264msec, maxt=40264msec

This is way outside system cache. Its also faster than many of the hardware raid vendors machines in this size class, and far more cost effective.
Read is about the same, about 1GB/s.
This is good.
[update] Its a little better than this

Run status group 0 (all jobs):
  WRITE: io=31,748MB, aggrb=864MB/s, minb=885MB/s, maxb=885MB/s, mint=36745msec, maxt=36745msec