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Re: XFS tune to adaptec ASR71605

To: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Subject: Re: XFS tune to adaptec ASR71605
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 7 May 2014 06:09:17 +1000
Cc: Steve Brooks <steveb@xxxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20140506155149.5cf056b5@xxxxxxxxxxxxxxxxxxxx>
References: <alpine.LRH.2.02.1405061104580.24742@xxxxxxxxxxxxxxxxxxxxxx> <20140506130008.13a1a7ee@xxxxxxxxxxxxxxxxxxxx> <alpine.LRH.2.02.1405061408480.24742@xxxxxxxxxxxxxxxxxxxxxx> <20140506155149.5cf056b5@xxxxxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, May 06, 2014 at 03:51:49PM +0200, Emmanuel Florac wrote:
> Le Tue, 6 May 2014 14:14:35 +0100 (BST)
> Steve Brooks <steveb@xxxxxxxxxxxxxxxx> écrivait:
> 
> > Thanks for the reply Emmanuel, I installed and rua bonnie++ although
> > I will need to research the results
> 
> Yup, they're... weird :) Write speed is abysmal, but random seeks very
> high. Please try my settings so that we can compare the numbers more
> directly:

Friends don't let friends use bonnie++ for benchmarking storage.
The numbers you get will be irrelevant to you application, and it's
so synthetic is doesn't reflect any real-world workload at all.

The only useful benchmark for determining if changes are going to
improve application performance is to measure your application's
performance.

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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