linux-kernel - Re: RAID-1 performance under 2.4 and 2.6

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Message-ID: <e2e108260803260142o34c33e7ajf395d5cb62824cb4@mail.gmail.com>
Date:	Wed, 26 Mar 2008 09:42:19 +0100
From:	"Bart Van Assche" <bart.vanassche@...il.com>
To:	"Emmanuel Florac" <eflorac@...ellique.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: RAID-1 performance under 2.4 and 2.6

On Tue, Mar 25, 2008 at 7:43 PM, Emmanuel Florac <eflorac@...ellique.com> wrote:
>
>  dd if=/dev/zero of=/mountpoint/testfile bs=1M count=1024

Keep in mind that the above test tests two subsystems at the same
time: RAID-1 + the filesystem on top of it. If you want to test RAID-1
performance you should specify a raw device to of=... instead of a
file (and the direct I/O flags). There are considerable performance
differences between filesystems for large files. E.g. XFS is a lot
faster than ext3 for large files (gigabytes).

Bart.
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