Re: 10g RAC Install with Raw Devices

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_at_ucdavis.edu> 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_at_ucdavis.edu
> (530) 754-6208
> -----Original Message-----
> From: oracle-l-bounce_at_freelists.org
> [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Alex Gorbachev
> Sent: Wednesday, March 28, 2007 8:07 PM
> To: naqimirza_at_yahoo.com
> Cc: tcarlson_at_tripos.com; oracle-l_at_freelists.org
> 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_at_yahoo.com> 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
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