Re: ASM for single-instance 11g db server?

From: Robert Klemme <shortcutter_at_googlemail.com>
Date: Mon, 04 Apr 2011 22:07:42 +0200
Message-ID: <8vumomFpemU1_at_mid.individual.net>



On 04.04.2011 15:10, Mladen Gogala wrote:
> On Mon, 04 Apr 2011 05:32:31 -0700, John Hurley wrote:
>
>> You can "always" still fight thru setting up and using RAW type storage
>> and avoid operating system overhead of file systems on linux if you want
>> to.
>
> You can avoid that overhead with file systems, too. Use direct I/O and
> there you have it. Oracle has filesystemio_options parameter since the
> version 9i.

Well, that would get rid of the OS level caching but not the file system overhead (managing inodes, blocks etc.).

http://unixfoo.blogspot.com/2008/01/what-is-direct-io.html

IIRC on Linux you would have to combine direct IO with raw device access to completely avoid OS level caching *and* FS overhead.

Kind regards

        robert

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Received on Mon Apr 04 2011 - 15:07:42 CDT

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