[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 <johnson at nmr.mgh.harvard.edu>:
>>
>>       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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>>
>> Chris Johnson               |Internet: johnson at nmr.mgh.harvard.edu
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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: johnson at nmr.mgh.harvard.edu
Systems Administrator       |Web:      http://www.nmr.mgh.harvard.edu/~johnson
NMR Center                  |Voice:    617.726.0949
Mass. General Hospital      |FAX:      617.726.7422
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