RE: 10g RAC Install with Raw Devices
- From: "William Wagman" <wjwagman@xxxxxxxxxxx>
- To: <gorbyx@xxxxxxxxx>, <naqimirza@xxxxxxxxx>
- Date: Thu, 29 Mar 2007 09:08:07 -0700
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
Other related posts:
