Btw, the CSS waits got properly instrumented in 11.2 but are not there in 11.1.0.7... Tanel. On Sat, Mar 17, 2012 at 2:41 PM, Riyaj Shamsudeen < riyaj.shamsudeen@xxxxxxxxx> wrote: > You have gotten good information from others already, I am little late :) > 1. Truss of DBWR process associated with RDBMS instance will show that > files are opened to the devices and writes performed, i.e. ASM is not > involved for direct I/O to the devices: > * * > > Write calls to file pointer 262: (truss output of a DBWR) > > /1: kaio(AIOWRITE, 262 , 0x6DD3C000, 8192, 0xFC17E6380F4E4000) = 0 > > ... > > -- //www.freelists.org/webpage/oracle-l