What kinds of things can cause a high CP_reads/writes ratio?  And what can I do about it? 

I have an Oracle system with ASM that doing writes in a 15 minute cycle, and it causes a lot of writes with CP reads.   The oracle ASM luns are basically the only thing on the aggregate.  Disk alignment is fine (which is the first thing I thought of).  I've attached a screenshot of the Oncommand graph for one of the disks in this aggr-- not sure if that will come through.

The filer is a 3220 with 8.1.2 7-mode.  Fibre channel attach, and there are about 20 luns under two volumes.

TIA,

Fred