Re: Optimum Block Size to use

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On 8/19/2015 1:54 PM, John Hodrien wrote:
On Wed, 19 Aug 2015, Jatin Davey wrote:

Hi All

We use CentOS 6.6 for our application. I have profiled the application and find that we have a heavy requirement in terms of Disk writes. On an average when our application operates at a certain load i can observe that the disk writes / second is around 2 Mbps (Average).

Initial thought is, do you really care? 2Mbps is peanuts, so personally I'd
leave everything at the defaults.  There's really no need to optimise
everything.

Obviously the exact type of writes is important (lots of small writes written
and flushed vs fewer big unsynced writes), so you'd want to poke it with
iostat to see what kind of writes you're talking about.
[Jatin]
The application workload is lot of small writes written and flushed.

jh
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Thanks
Jatin

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