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From Alan Carroll <solidwallofc...@yahoo-inc.com>
Subject Re: IO performance
Date Fri, 23 Jan 2015 22:24:58 GMT
Changing the default IO buffer size setting will have no effect on writing to disk. As far
as I can tell the cache logic is hardwired to write in at most 4M sized chunks.

 

     On Thursday, January 22, 2015 9:03 PM, Steven Hunter <steveoplier@gmail.com> wrote:
   

 A second or more HDS up to 4 would work greatStevenHunterOn Jan 14, 2015 11:31 AM, "Daniel
Biazus" <daniel.biazus@azion.com> wrote:

Hey Guys,
    As you can see at the following iostat output, We have a lot of writes into the cache,
:-)  and the IO wait is a bit higher than expected. 
               Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s
  wsec/s avgrq-sz avgqu-sz   await  svctm  %util(storage) sda               0.00
    0.00   17.00   26.00  6094.00 13144.00   447.40     0.94   19.77   6.05  26.00(interim)
 sdb               0.00     0.00   85.00   13.00 12523.00  8706.00   216.62
    0.18    1.86   0.84   8.20
I was wondering if would be possible to enhance the write IO performance by increasing the
IO buffers.
I thought, I would increase the proxy.config.io.max_buffer_size, from 32768 to a much higher
value. 
Any thoughts about it ?
Thank you!
-- 



Daniel Biazusinfrastructure EngineeringAzion TechnologiesPorto Alegre, Brasil +55 51 3012
3005 | +55 51 82279032Miami, USA +1 305 704 8816
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