Either is enough for enable directio. For the difference between filesystemio_options=3Dasynch and disk_asynch_io=3Dtrue, the first one only applies to datafiles on filesystem, while the second apply to all datafile write. If the second is set to false oracle always disable asynch write. On 5/10/05, steve noyle <stevenoyle1@xxxxxxxxx> wrote: > I'm confused with the difference between setting >=20 > filesystemio_options=3Dasynch and > disk_asynch_io=3Dtrue >=20 > Which of the above two parameters determine if asyncio > is turned on? >=20 > The other confusion I have is we already have > forcedirectio turned on at the mount point level for > all oracle data files. The parameter, > filesystemio_options was introduced in 9i and now > according to the documentation we can turn on direct > IO by setting filesystemio_options=3DdirectIO. > So, now to use Direct IO for all Oracle data files, do > we have to turn on directio at the mount point level > and set filesystemio_options=3DdirectIO at the same time > or is turning on forcedirectio at the mount point > level sufficient to guarantee directio? >=20 > We are running 9.2.0.4 on Solaris 8. >=20 > thanks. >=20 > steve >=20 >=20 > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > -- > //www.freelists.org/webpage/oracle-l >=20 --=20 Regards Zhu Chao www.cnoug.org -- //www.freelists.org/webpage/oracle-l