Direct I/O is enabled simply be specifying in the
mount options in /etc/vfstab (on Solaris). You can do
it even with standard ufs volumes. As long as you
have vxfs then you can also have vxfs with direct IO
Quick I/O is the separately licensed bit I think - it
should also outperform Direct I/O.
Still - I'm a fan of raw over either...
Cheers
Connor
- KC <kchan_at_speednet.com.au> wrote: > 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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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"
Do You Yahoo!?
Get your free @yahoo.co.uk address at
http://mail.yahoo.co.uk
or your free @yahoo.ie address at
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--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: =?iso-8859-1?q?Connor=20McDonald?=
INET: hamcdc_at_yahoo.co.uk
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
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Received on Wed Jun 20 2001 - 02:21:40 CDT
