Re: Low Budget Performance

On Tue, 2002-10-29 at 11:31, Andrew Sullivan wrote:
> On Tue, Oct 29, 2002 at 09:10:31AM -0800, Josh Berkus wrote:
> >
> > Out of curiousity, what is it with RAID 5? I've encountered the poor
> > write performance too ... any idea why?
>
> It largely depends on the controller and te implementation. It has
> to do with the cost of calculating the checksum. If the
> implementation of that is inefficient, the writes become inefficient.

A high-quality smart controller with lots of cache RAM definitely
negates the RAID5 performance issues.

(Of course, I'm referring to enterprise-level rack-mounted h/w
that costs big bucks...)

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