P9000Watch and P9000Sketch Reference guide for HP StorageWorks P9000 Performance Advisor v5.2 (T1789-96319, May 2011)

NOTE:
We can conclude all the front-end I/Os on the RAID group are writes because the r_H% (cache read
hit %) is 0; that is, there are no front-end reads.
Understanding write ratio in P9000Watch70