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From: "Drew Tomlinson" <drew@mykitchentable.net>
To: <peo@intersonic.se>, "Chuck Swiger" <cswiger@mac.com>
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Date: Fri, 30 May 2003 11:57:33 -0700
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cc: freebsd-questions@freebsd.org
Subject: Re: Vinum performance
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----- Original Message ----- 
From: "Per olof Ljungmark" <peo@intersonic.se>
To: "Chuck Swiger" <cswiger@mac.com>
Cc: <freebsd-questions@freebsd.org>
Sent: Friday, May 30, 2003 8:41 AM


> > What ratio of reads to writes do you expect?
>
> Had no expectations really, I'm new to Vinum.
>
> >> Copying 170 files total 319MB TO the Vinum volume takes about 2m45s.
> >> Copying same files FROM the Vinum volume to another volume on a
> >> hardware raid5 controller takes 43s.
> >
> >
> > A 3-1 ratio in speeds for software RAID-5 versus hardware doesn't strike
> > me as being very wrong....
> >
> >> This machine is not in production yet so I can still make changes to
> >> the configuration. The current block size is 16384 and the stripe size
> >> 419k. I assume it would be a good idea to change that to for example
> >> 491,520?
> >
> >
> > ...or try a few stripe sizes, such as 64K or 128K.

FWIW - The man page suggests avoiding powers of 2 and a minimum 128K strip
size.

Cheers,

Drew

> Thanks for your comments, I felt it was a good idea just to check before
> we start to use this piece seriously then I will not be able to touch it
> for changing configuration. Will try different stripe sizes as per your
> advice.
>
> /per olof
>
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