RE: asynch I/O

Of course, that is the default for Windows NT, 2000 and 2003 as well. ;)

On Fri, 2003-09-19 at 09:29, Jesse, Rich wrote:
> And on some platforms, like OpenVMS, async IO isn't an option -- it's the
> default. :)
>
> Rich
> OpenVMS bigot, despite not having any more VMS boxen around... :(
>
> Rich Jesse System/Database Administrator
> rjesse_at_qtiworld.com Quad/Tech Inc, Sussex, WI USA
>
>
> > -----Original Message-----
> > From: Tanel Poder [mailto:tanel.poder.003_at_mail.ee]
> > Sent: Friday, September 19, 2003 11:05 AM
> > To: Multiple recipients of list ORACLE-L
> > Subject: Re: asynch I/O
> >
> >
> > I just hit a description of async IO in Oracle docs, it is very simply
> > described there:
> >
> > <quote>
> > With synchronous I/O, when an I/O request is submitted to the
> > operating
> > system, the writing process blocks until the write is
> > confirmed as complete.
> > It can then continue processing.
> > Asynchronous I/O allows a process to submit an I/O request but to then
> > continue processing. It may then check on the result of the
> > I/O at a later
> > time. It is also possible to submit several I/O requests and
> > then collect
> > the status of those requests at a later time, thus allowing
> > the operating
> > system to parallelize any of those I/O operations, where
> > possible. Parallel
> > processing can reduce the overall time to complete an operation.
> >
> > Consider an extreme example: Imagine you want to write out
> > four data blocks
> > to four different files. With synchronous I/O you must submit
> > block 1, wait,
> > submit block 2, wait, submit block 3, wait, submit block 4,
> > and wait. With
> > asynchronous I/O, you can submit blocks 1, 2, 3, and 4 and
> > then wait for all
> > four blocks to complete. Because you gave the operating
> > system all four I/O
> > requests at once, it can act on all the requests in parallel.
> > The total
> > response time is only the duration of the longest I/O of the
> > four, rather
> > than the sum of all four I/O durations.
> >
> > </quote>
> >
> > Tanel.
> >
> > ----- Original Message -----
> >
> > To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> > Sent: Friday, September 19, 2003 5:24 PM
> >
> >
> > > Ryan,
> > >
> > > You can have separate mount points from your server's
> > perspective, but
> > once you get into the NetApp it's just a pool of disk drives that are
> > allocated as necessary by their WAFL (Write Anywhere File
> > Layout) system.
> > Therefore in reality you get zero benefit.
> > >
> > > Dick Goulet
> > > Senior Oracle DBA
> > > Oracle Certified 8i DBA
> > >
> > > -----Original Message-----
> > > Sent: Thursday, September 18, 2003 10:10 PM
> > > To: Multiple recipients of list ORACLE-L
> > >
> > >
> > > Could you clarify something for me? Are you saying that if I have a
> > variety
> > > of 'mounts' on our netapp
> > >
> > > say
> > >
> > > /mnt1
> > > /mnt2
> > >
> > > I would not benefit by putting my datafiles on seperate
> > ones? I thought
> > that
> > > is where my I/O waits are coming from. Since we have all of
> > our datafiles
> > in
> > > the same directory?
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Jesse, Rich
> INET: Rich.Jesse_at_qtiworld.com
>
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-- 
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-- 
Author: Jared Still
  INET: jkstill_at_cybcon.com

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