Just found some tools for determining which process is utilizing all the IO from OS perspective for Solaris , very cool, can't tell you how many times I see all the disk being used and can't tell which process it is (assume multiple db's/mid tiers all on same box). I added prusage to my toolkit right away. http://users.tpg.com.au/adsln4yb/psio.html -- //www.freelists.org/webpage/oracle-l