How to track IOPS statistics? Is there a way to access statistics about IO operations per second in DB2 9.7? I am not interested in the buffer pool hit ratio, just IOPS.

Storage managers reported us that a few days ago average IOPS is over 5000  (previously it was 300 they said). I just want to track those numbers which storage managers reported us because I do not want to this problem re-occur.
This is a matter of looking at physical writes per buffer pool or tablespace over time.  db2top will tell you this if you are in Delta mode and look at the "Delta p_reads/s" column.