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Re: XFS tune to adaptec ASR71605

To: Steve Brooks <steveb@xxxxxxxxxxxxxxxx>
Subject: Re: XFS tune to adaptec ASR71605
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Tue, 6 May 2014 15:51:49 +0200
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <alpine.LRH.2.02.1405061408480.24742@xxxxxxxxxxxxxxxxxxxxxx>
Organization: Intellique
References: <alpine.LRH.2.02.1405061104580.24742@xxxxxxxxxxxxxxxxxxxxxx> <20140506130008.13a1a7ee@xxxxxxxxxxxxxxxxxxxx> <alpine.LRH.2.02.1405061408480.24742@xxxxxxxxxxxxxxxxxxxxxx>
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

bonnie++ -f -d ./ -n 50

If you translate the output from my test file with bon_csv2

Did you turn off write cache? did you tune the IO scheduler, read
ahead, and queue length? Here are the settings I'm generally using
with this type of controllers (for better sequential IO):

echo none > /sys/block/sda/queue/scheduler
echo 1024 > /sys/block/sda/queue/nr_requests
echo 65536 > /sys/block/sda/queue/read_ahead_kb

You can check the cache status in the output from 

arcconf getconfig 1 

If you didn't install arcconf, you definitely should :) If you turned
off the write cache, be aware that this is not the expected mode of
operation for modern RAID controllers... Go buy a ZMM if necessary.

Emmanuel Florac     |   Direction technique
                    |   Intellique
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