RE: 10g RAC Install with Raw Devices

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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