Re: NFS and direct IO

From: Jamey Johnston <jj_at_jameyj.com>
Date: Sun, 17 Apr 2011 23:56:08 -0500
Message-Id: <FB88561B-CC85-48AF-AA50-167D3BD0D5BF_at_jameyj.com>

Is this 11g? If so, have you looked at using Direct NFS? If you do be sure to patch to the latest patches including one-offs that are for DNFS and your platform.

We have seen significant performance gains with DNFS and Solaris and NetApp (around 25-30%).

jbj2

--

Jamey Johnston

On Apr 17, 2011, at 11:40 PM, kyle Hailey <kylelf_at_gmail.com> wrote:



> 

> I consider  CIO on AIX an optimization option and not required.

> 

> This particular client is on HP and we are using forecedirectio. I had thought that forcedirectio mount option didn't make a difference unless the database was using filesystemio_options=setall or directio, but now I have some doubts and will test tomorrow.

> 

> Best Wishes

> Kyle Hailey

> http://dboptimizer.com

> 

> 

> On Sun, Apr 17, 2011 at 8:18 PM, Chitale, Hemant Krishnarao <Hemant.Chitale_at_sc.com> wrote:

> 

> The note still requires forcedirectio on Solaris and HPUX and cio on AIX even for non-RAC implementations.

> 

> Kyle,

> It's not clear to me if the NFS implementation is on Linux or on a Unix flavour, because you say " The NFS database is using direct-IO so there is no longer the buffering from the UNIX."

> 

> 

> Hemant K Chitale

> 

> -----Original Message-----

> From: D'Hooge Freek [mailto:Freek.DHooge_at_uptime.be]

> Sent: Sunday, April 17, 2011 1:46 AM

> To: kylelf_at_gmail.com; ORACLE-L

> Subject: RE: NFS and direct IO

> 

> Kyle,

> <deleted>

> 

> Directio is only required on linux when working with rac.

> See note Mount Options for Oracle files when used with NAS devices [ID 359515.1]

> 

> Regards,

> 

> 

> Freek D'Hooge

> Uptime

> Oracle Database Administrator

> email: freek.dhooge_at_uptime.be

> tel +32(0)3 451 23 82

> http://www.uptime.be

> disclaimer: www.uptime.be/disclaimer

> ________________________________________

> From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of kyle Hailey

> Sent: zaterdag 16 april 2011 18:31

> To: ORACLE-L

> Subject: NFS and direct IO

> 

> Is there any requirement to use direct I/O with NFS? (besides performance)

> 

> from metalink note: Enterprise Linux: Linux, Filesystem & I/O Type Supportability [ID 279069.1]

> 

>     DIRECTIO is required for database files on NAS (network attached storage).

> 

> Is it really  required? I can't find any other reference that supports this.

> 

> <deleted>

> 

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Received on Sun Apr 17 2011 - 23:56:08 CDT