satheesh, you can check "Raid - High performance,reliable storage" by peter chen et al.... regards -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Satheesh.Babu@xxxxxxxxxxxxxxxxxx Sent: Tuesday, June 15, 2004 6:32 PM To: oracle-l@xxxxxxxxxxxxx Subject: RAID List, RAID 0+1 or RAID 1+0, which one is better for oltp application. Any pointer could be more useful. Thanks and Regards, Satheesh Babu.S Bangalore.