Re: What the difference between qio and direct I/O option in VxFS

Quick I/O is part of the database edition. Direct I/O is a generic mount option for vxfs artition (standard part of vxfs). Mounting something convosyn=direct avoids s buffer cache for everything, whereas quick i/o actually provides an interface for accessing the file as a raw character device.

George

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Wednesday, June 20, 2001 8:51 AM

> Direct I/O is part of the Database Edition.
>
> "Walking on water and developing software from a specification are easy if
> both are frozen."
>
> Christopher R. Spence
> Oracle DBA
> Fuelspot
>
>
>
> -----Original Message-----
> Sent: Tuesday, June 19, 2001 8:15 PM
> To: Multiple recipients of list ORACLE-L
> VxFS
>
>
> Connor,
>
> Thanks for the info. Is Direct I/O licensed with the Veritas Volume
manager
> or the Database edition?? We want to be able to avoid double buffering,
> sound like Direct I/O is what we want, however our SysAdmin insisted that
we
> need to purchase the Database edition, I thought Direct I/O came with the
> VxFS file system, maybe the SysAdmin confused Direct I/O to raw ,please
> clarify??
>
> KC
>
>
> -----Original Message-----
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Date: Wednesday, June 20, 2001 2:53 AM
>
>
> >
> >Direct IO is the capacity to perform operations
> >without the data being passed through the Unix buffer
> >cache (it goes straight to/from the disks to the
> >Oracle buffer cache)
> >
> >Quick IO is Veritas's simulation of raw datafiles - it
> >presents the file to Oracle as if it were raw.
> >
> >hth
> >connor
> >
> >--- KC <kchan_at_speednet.com.au> wrote: > Dear List,
> >>
> >> What the difference between qio and direct I/O
> >> option in Veritas file system VxFS??
> >>
> >> KC
> >>
> >
> >
> >=====
> >Connor McDonald
> >http://www.oracledba.co.uk (mirrored at
> >http://www.oradba.freeserve.co.uk)
> >
> >"Some days you're the pigeon, some days you're the statue"
> >
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> Author: KC
> INET: kchan_at_speednet.com.au
>
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> Author: Christopher Spence
> INET: cspence_at_FuelSpot.com
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: George Schlossnagle
  INET: george_at_omniti.com

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