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

Connor,

You have confirmed what I believed to be true, you don't need the Veritas database edition for direct I/O. Just need to convince our SysAdmin now.

KC

-----Original Message-----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: Wednesday, June 20, 2001 5:44 PM

>
>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 http://mail.yahoo.ie
>--
>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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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: KC
  INET: kchan_at_speednet.com.au

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
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