Date: Fri, 18 Jun 1999 01:14:20 -0700 From: Darryl Okahata <darrylo@sr.hp.com> To: freebsd-hackers@freebsd.org Subject: Re: vinum performance Message-ID: <199906180814.BAA29087@mina.sr.hp.com> In-Reply-To: Your message of "Thu, 17 Jun 1999 17:47:47 %2B0930."
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Greg Lehey <grog@lemis.com> wrote:
> On Thursday, 17 June 1999 at 3:43:10 -0400, David E. Cross wrote:
> > I have a drive that is rated at ~16 Meg/second, and indeed it delivers on t
> he
> > order of 15+ Meg/second. If I use Vinum to create a concatinated device
> > of 2 such units performance drops to 2.5 Meg/sec. This seems like a
> > drastic drop in performance.
>
> Indeed, if you're comparing apples with apples.
Possible marginally-related data point: with the 3.1-RELEASE vinum,
and with striped drives (yes, I know the original user is using
concatenated devices), I saw pretty bad write performance with the
default filesystem frag size. Increasing the frag size (via newfs),
increased performance substantially.
--
Darryl Okahata
darrylo@sr.hp.com
DISCLAIMER: this message is the author's personal opinion and does not
constitute the support, opinion, or policy of Hewlett-Packard, or of the
little green men that have been following him all day.
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