William, look at this on metalink (and search for O_DIRECT)<https://metalink.oracle.com/metalink/plsql/f?p=130:14:5760572964337490118::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,220970.1,1,1,1,helvetica> On 3/29/07, William Wagman <wjwagman@xxxxxxxxxxx> wrote:
Alex, Can you provide some pointers to further information on this subject. Thanks. Bill Wagman Univ. of California at Davis IET Campus Data Center wjwagman@xxxxxxxxxxx (530) 754-6208 -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Alex Gorbachev Sent: Wednesday, March 28, 2007 8:07 PM To: naqimirza@xxxxxxxxx Cc: tcarlson@xxxxxxxxxx; oracle-l@xxxxxxxxxxxxx Subject: Re: 10g RAC Install with Raw Devices Don't use raw devices if you are running Oracle 10.2.0.2 (or 3?) on Linux. * Raw devices are being kind of depreciated in Linux. * Additional level of complexity (bind + permissions) so more likely to fail. The problem with block devices (/dev/sd*) is that IO to block devices is buffered IO - going via OS cache. Unless you open them with O_DIRECT flag. Starting with 10.1 (IIRC) Oracle adds this to datafile open call (filesystemio_options must be at least directio?). With 10.2.0.1 the same is done for OCR - it's opened with O_DIRECT. However, voting disks open call still have a bug so during installation of 10.2.0.1 you will need to bind voting disks at least. After upgrade to later patchset (I think 10.2.0.2 is enough but don't remember - need to check list of bugs fixed), voting disk is also opened with O_DIRECT. On 3/28/07, Naqi Mirza <naqimirza@xxxxxxxxx> wrote: > > How did you setup the raw devices ? Did you bind raw partitions to your raw > devices. I'm not an expert on linux but I see you're specifying /dev/sda2 - > once bound shouldnt this be something like /dev/raw/raw1 ? > I haven't had the installer complain about devices, but I have had clufvy > fail on the shared storage check - but that was specific to the hp-ux > platform. -- Best regards, Alex Gorbachev http://www.oracloid.com -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l