Re: [Gluster-devel] Striping.

[Chris Johnson]

On Thu, 29 Nov 2007, Anand Avati wrote:

     So what I'm hearing is that my test iss too simple.  That right?

> Chris,
> you will see the help of stripe when you perform IO where disk head is the
> bottleneck. For example try to dd a file > 2x RAM size. Then dd with stripe.
> you will note that the 'rock bottom throughput' is lifted higher with
> stripe. It also helps when one file is accessed by a LOT of clients so that
> one machine's IO does not become a bottleneck.
>
> avati
>
> 2007/11/29, Chris Johnson <address@hidden>:
> >       Hi again,
> >
> >       So I did my dd read test of my 24MB file on a simple two brick
> > stripe.  Nothing fancy.  Two bricks and the stripe define on the server
> > side.  Client side mounts the remote stripe.  Default block size,
> > 128KB.
> >
> >       No difference between that and my single brick test as far as
> > time goes.  What's striping supposed to get me?  I thought it was
> > drives heads.  Or am I missing something again?
> >
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> >
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>
>
> --
> It always takes longer than you expect, even when you take into account
> Hofstadter's Law.
>
> -- Hofstadter's Law

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Chris Johnson               |Internet: address@hidden
Systems Administrator       |Web:      http://www.nmr.mgh.harvard.edu/~johnson
NMR Center                  |Voice:    617.726.0949
Mass. General Hospital      |FAX:      617.726.7422
149 (2301) 13th Street      |What the country needs is dirtier fingernails and
Charlestown, MA., 02129 USA |cleaner minds.  Will Rogers
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