they'll both be here in two weeks, I'm selling tickets to the fight now
:)
- "Fink, Dan" <Dan.Fink_at_mdx.com> wrote:
> You best be careful, Jared. You KNOW how uptight and evil Tim can be!
> :)
>
> -----Original Message-----
> Sent: Wednesday, November 27, 2002 9:56 AM
> To: Multiple recipients of list ORACLE-L
>
>
> Oh boy, is my face red!
>
> I remembered that of course, as soon as I saw this.
>
> I need to keep better track of who I'm plagierizing. :)
> Jared
>
>
>
>
>
>
> "Cary Millsap" <cary.millsap_at_hotsos.com>
> Sent by: root_at_fatcity.com
> 11/26/2002 03:05 PM
> Please respond to ORACLE-L
>
>
> To: Multiple recipients of list ORACLE-L
> <ORACLE-L_at_fatcity.com>
> cc:
> Subject: RE: LGWR using lots of CPU time, low CPU
> usage
>
>
> The ultimate sincerest form of flattery is for someone to attribute
> something smart to you that you wish you had done but, alas, did not
> actually do.
>
> (It was Tim Gorman who posted the excellent analogy.)
>
>
> Cary Millsap
> Hotsos Enterprises, Ltd.
> http://www.hotsos.com
>
> Upcoming events:
> - Hotsos Clinic, Dec 9-11 Honolulu
> - Hotsos Clinic 101, Jan 7-9 Knoxville
> - Steve Adams's Miracle Master Class, Jan 13-15 Copenhagen
> - 2003 Hotsos Symposium, Feb 9-12 Dallas
>
>
> -----Original Message-----
> Jared.Still_at_radisys.com
> Sent: Tuesday, November 26, 2002 4:07 PM
> To: Multiple recipients of list ORACLE-L
>
> > >And "old school" is still right about not putting RedoLogs onto
> RAID5.
>
> > From what I'm being told, this is not your father's RAID5. This is
> what
>
> >they tell me:
>
> > The CPU hands the IO to the disk controller and rather than do the
> > physical disk IO while the process waits, the disk controller
> caches
> > it to local memory and says done. Therefore, effectively there is
> no
> > wait for IO and it doesn't matter if we are RAID 5 or RAID 0+1,
> > the system is NOT waiting for the IO. He said the only time there
> might
> > be a delay is during the cache's battery refresh times. I checked
> your
> > dates and it was not occurring during those times. Also, if you
> look
> > at the iostat statistics under the 'wait' and '%w' headers you will
> > see all zeros.
>
> Debi,
>
> That is true, up to a point.
>
> Think of the cache as a water tank. You have a garden hose
> filling up the tank. You can keep increasing the water
> pressure for a while.
>
> But the outlet at the other end of the tank has a fixed
> capacity. It flows 10 GPM, and no more.
>
> What happens when you increase the flow at the intake to
> 20 GPM?
>
> The tank fills up.
>
> When the tank fills up, your intake flow will need to decrease,
> because you can only flow 10 GPM at the outlet.
>
> Now, think of the outlet as writing to disk, the RAID5 cache
> is the water tank, and your database is the inlet that wants
> to run at 20 GPM.
>
> If your database activity will never be intensive enough to
> stress the cache like this, no problem. But 'never' is a
> very long time.
>
> If any of this sound familiar, Cary Millsap posted a very similar
> explanation a few weeks ago.
>
> Plagierism is the sincerest form of flattery. :)
>
> Jared
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author:
> INET: Jared.Still_at_radisys.com
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
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> Author: Cary Millsap
> INET: cary.millsap_at_hotsos.com
>
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> Author:
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>
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> Author: Fink, Dan
> INET: Dan.Fink_at_mdx.com
>
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Received on Wed Nov 27 2002 - 13:44:55 CST
