Re: 10g RAC Install with Raw Devices
- From: "Alex Gorbachev" <gorbyx@xxxxxxxxx>
- To: naqimirza@xxxxxxxxx
- Date: Wed, 28 Mar 2007 22:06:39 -0500
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
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