What's the process experiencing all these waits? Is it DIAG or DBWR? "Gogala, Mladen" <MGogala@allegients To: "'dba.orcl@xxxxxxxxx'" <dba.orcl@xxxxxxxxx>, oracle-l ystems.com> <oracle-l@xxxxxxxxxxxxx> Sent by: cc: oracle-l-bounce@fre Subject: RE: async disk IO in RAC elists.org 09/14/2005 02:45 PM Please respond to MGogala This means that your're waiting on OS to perform async I/O. In short, try with disk_asynch_io=FALSE and see what you get. Open a TAR with oracle support. -- Mladen Gogala Ext. 121 From: Sami Seerangan [mailto:dba.orcl@xxxxxxxxx] Sent: Wednesday, September 14, 2005 12:19 PM To: oracle-l Subject: async disk IO in RAC We are experiencing so much "async disk IO" wait event as below. -- //www.freelists.org/webpage/oracle-l