Since the Celerra just hands IO requests back to the storage array (Clariion or Symmetrix), it would not consider RAID effects in it's performance numbers.  You would need to calculate that or use the backend array's performance tools (Analyzer for CX, SPA for Symmetrix) to see what the IO load looks like at the array front end and disk level.
Looking at a file system that has the following IO:  1000 Write Requests 950 Read Requests 1950 Total Requests  Does the 1000 Write requests take into account Write Penalty (Raid 5 x4, Raid 1/0 x2)?
Does Celerra Monitor take into account Write Penalty?