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Re: Async_io set up HP-UX for 10g Instances(these are apps instances)

From: amonte <ax.mount_at_gmail.com>
Date: Fri, 3 Aug 2007 09:50:24 +0200
Message-ID: <85c1fb130708030050g354f910p7ad693cf6bc8051d@mail.gmail.com>


You have already being told. You gain nothing if the operating system does not support Asycnhronous I/O

Alex

On 8/2/07, edwin devadanam <edwin_kodamala_at_yahoo.com> wrote:
>
> okay if i want to change disk_asynch_io = TRUE ...on what basis i can
> change...i mean
> what advantages!
> Thanks,
> Edwin.K
>
> *amonte <ax.mount_at_gmail.com>* wrote:
>
> Read *Note:139272.1*
>
> and you can see as LSC already pointed out
>
> on HP-UX,
> aio is *only* possible on a raw device. Put in another way, aio *cannot* be used on a filesystem.
>
>
> Quite clear
>
>
> On 8/2/07, edwin devadanam <edwin_kodamala_at_yahoo.com> wrote:
> >
> > Cheng,
> >
> > the raw files system is for solaris server.
> >
> > We are using normal Filesystem.
> > Already Async io is set in couple of other HP-UX servers........
> >
> > on what basis can we change disk_asynch_io = FALSE to
> > disk_asynch_io = TRUE (PLease see below information for clarity of my
> > requirement)
> >
> > Any docs pertaining to disk_asynch_io = TRUE and its Advantages
> >
> > Thanks,
> > Edwin.K
> >
> > *LS Cheng < exriscer_at_gmail.com>* wrote:
> >
> > You need to setup raw devices to use AIO in HP-UX. No chance if you are
> > using vxfs.
> >
> > Thanks
> >
> > --
> > LSC
> >
> > On 8/2/07, edwin devadanam < edwin_kodamala_at_yahoo.com> wrote:
> > >
> > > Hi
> > >
> > > We have this setup
> > > db_writer_processes = 4 disk_asynch_io = false
> > >
> > > I have doubts whether i can set the below on....
> > > please suggest advantages and disadvantages of below setting.......on
> > > HP-UX
> > > disk_asynch_io = TRUE
> > > tape_asynch_io = TRUE
> > >
> > > am unclear mainly about
> > > disk_asynch_io,db_writer_processes,DBWR_IO_SLAVES
> > >
> > > Any help would be appreciated.
> > >
> > > Regards,
> > > Edwin.K
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Received on Fri Aug 03 2007 - 02:50:24 CDT

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