mysql scaling questions

Mike Tancsa mike at
Tue Dec 4 01:42:58 PST 2007

At 04:22 AM 12/4/2007, Gergely CZUCZY wrote:
>On Sat, Dec 01, 2007 at 04:06:55PM -0500, Mike Tancsa wrote:
> > At 03:56 PM 12/1/2007, Gergely CZUCZY wrote:
> > >I don't quite understand the question. It's the very same box, with
> > >a dualboot configuration.
> >
> > Fire up the 3ware controller's RAID management software and make 
> sure the same write caching strategy is set for FreeBSD and Linux. 
> The driver my
> > default to different values.
> >
> > i.e. under "controller settings" make sure "write cache" and 
> "queuing" are the same values for linux and freebsd.
>I fail to see such an option, not under the 3ware BIOS software, nor 
>in the tw_cli interface.
>Could you be more specific on this?
>Note: in the BIOS i've seen WC turned on for all units, and there were no
>OS-specific options.

         Its not in the bios, but in the management daemon.  On 
FreeBSD, go to /usr/ports/sysutils/3dm and install the daemon.  Start 
up 3dm2, point your browser to  and login.  Go 
to management menu and look at "controller settings" and there will 
be the values of write cache and queuing and storsav.  Make sure the 
values set there, are the same on Linux and FreeBSD.  You can 
download the LINUX version from 3ware's website.


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