Re: write-behind has no measurable effect?

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On Tue, Feb 15, 2011 at 06:10:17AM -0300, Roberto Spadim wrote:

> andras could you make some benchmarks to raid1 with round robin read balance?
> at this site:
> www.spadim.com.br/raid1/
> 
> it's kernel 2.6.37 based

Yes, I can do that. Can you give me some hints on what specific
configuration to try? I see you have some sysfs tunables. My raid1 array
consists of two spinning disks and an SSD, all local.

Do you expect this patch to make a difference in my case? With the spinning
disks marked as write-mostly, I'm getting close to the read performance of
the SSD (except for very small random reads, for some reason).

It's random writes that are much slower than with only the SSD.

-- 
                     Andras Korn <korn at elan.rulez.org>
                  There is no spoon(). But there is a fork().
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