>>> On Fri, Dec 8, 2006 at 12:18 PM, in message
<1165601938.10248.56.camel@dba5.int.libertyrms.com>, Brad Nicholson
<bnichols@ca.afilias.info> wrote:
>
> How much increased I/O usage have you seen in regular operation with
> those settings?
We have not experience any increase in I/O, just a smoothing. Keep in
mind that the file system cache will collapse repeated writes to the
same location until things settle, and the controller's cache also has a
chance of doing so. If we just push dirty pages out to the OS as soon
as possible, and let the file system do its job, I think we're in better
shape than if we try to micro-manage it within our buffer pages.
You mileage may vary of course, but I'm curious whether any real world
production examples exist where this approach is a loser.
-Kevin