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Re: Fastest Chunk Size w/XFS For MD Software RAID = 1024k

from [Justin Piszcz] [Permanent Link][Original]
To: Peter Rabbitson <rabbit@xxxxxxxxx>
Subject: Re: Fastest Chunk Size w/XFS For MD Software RAID = 1024k
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Date: Thu, 28 Jun 2007 04:27:15 -0400 (EDT)
Cc: linux-raid@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, Alan Piszcz <ap@xxxxxxxxxxxxx>
In-reply-to: <46837056.4050306@xxxxxxxxx>
References: <Pine.LNX.4.64.0706271918010.29111@xxxxxxxxxxxxxxxx> <46832E60.9000006@xxxxxxxxx> <Pine.LNX.4.64.0706280406520.1406@xxxxxxxxxxxxxxxx> <46837056.4050306@xxxxxxxxx>
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On Thu, 28 Jun 2007, Peter Rabbitson wrote:


Justin Piszcz wrote:

mdadm --create \
      --verbose /dev/md3 \
      --level=5 \
      --raid-devices=10 \
      --chunk=1024 \
      --force \
      --run
      /dev/sd[cdefghijkl]1

Justin.
Interesting, I came up with the same results (1M chunk being superior) with a completely different raid set with XFS on top: 

mdadm   --create \
        --level=10 \
        --chunk=1024 \
        --raid-devices=4 \
        --layout=f3 \
        ...

Could it be attributed to XFS itself?

Peter
Good question, by the way how much cache do the drives have that you are testing with? 

Justin.
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