async disk IO in RAC

We are experiencing so much "async disk IO" wait event as below.

What could be wrong? Do I have to look at any init parameters?

SQL> select inst_id,SECONDS_IN_WAIT,sid,event from gv$session_wait where EVENT='async disk IO';  

 INST_ID SECONDS_IN_WAIT SID EVENT
---------- --------------- ---------- ------------------------------
 1 186185 2 async disk IO
 3 186183 2 async disk IO
 2 186184 2 async disk IO

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http://www.freelists.org/webpage/oracle-l Received on Wed Sep 14 2005 - 11:34:56 CDT