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Message-ID: <4ad99e050511220146i2fd7d001va55a7ca9daa7188@mail.gmail.com>
Date: Tue, 22 Nov 2005 10:46:13 +0100
From: Lars Roland <lroland@gmail.com>
To: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
Subject: Re: Poor Software RAID-0 performance with 2.6.14.2
Cc: Linux-Kernel <linux-kernel@vger.kernel.org>
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On 11/21/05, Lennart Sorensen <lsorense@csclub.uwaterloo.ca> wrote:
> > dkstorage01:~# hdparm -t /dev/md0
> > /dev/md0:
> >  Timing buffered disk reads:  182 MB in  3.01 seconds =  60.47 MB/sec
> >
> > dkstorage02:~# hdparm -t /dev/hdc1
> > /dev/hdc1:
> > Timing buffered disk reads:  184 MB in  3.02 seconds =  60.93 MB/sec
>
> How about at least testing one of the drives involved in the raid,
> although I assume they are identical in your case given the numbers.

There are four identical drives in the machines although I only stripe
on two of them - I can assure you that I get the same numbers from all
the drives - I should ofcause have put this info in the orig post.

>
> Did you test this with other kernel versions (older ones) to see if it
> was better in the past?

Also tried 2.4.27 and 2.4.30 - no difference there.
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