Re: NFS and direct IO
- From: kyle Hailey <kylelf@xxxxxxxxx>
- To: "Chitale, Hemant Krishnarao" <Hemant.Chitale@xxxxxx>
- Date: Sun, 17 Apr 2011 21:40:57 -0700
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@xxxxxx> 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@xxxxxxxxx]
> Sent: Sunday, April 17, 2011 1:46 AM
> To: kylelf@xxxxxxxxx; 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@xxxxxxxxx
> tel +32(0)3 451 23 82
> http://www.uptime.be
> disclaimer: www.uptime.be/disclaimer
> ________________________________________
> From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
> 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>
>
> This email and any attachments are confidential and may also be privileged.
> If you are not the addressee, do not disclose, copy, circulate or in any
> other way use or rely on the information contained in this email or any
> attachments. If received in error, notify the sender immediately and delete
> this email and any attachments from your system. Emails cannot be
> guaranteed to be secure or error free as the message and any attachments
> could be intercepted, corrupted, lost, delayed, incomplete or amended.
> Standard Chartered PLC and its subsidiaries do not accept liability for
> damage caused by this email or any attachments and may monitor email
> traffic.
>
>
>
> Standard Chartered PLC is incorporated in England with limited liability
> under company number 966425 and has its registered office at 1 Aldermanbury
> Square, London, EC2V 7SB.
>
>
>
> Standard Chartered Bank ("SCB") is incorporated in England with limited
> liability by Royal Charter 1853, under reference ZC18. The Principal Office
> of SCB is situated in England at 1 Aldermanbury Square, London EC2V 7SB. In
> the United Kingdom, SCB is authorised and regulated by the Financial
> Services Authority under FSA register number 114276.
>
>
>
> If you are receiving this email from SCB outside the UK, please click
> http://www.standardchartered.com/global/email_disclaimer.html to refer to
> the information on other jurisdictions.
>
>
Other related posts:
