From: Lars Marowsky-Bree <lmb@suse.de>
To: Vladimir Milovanovic <vlad@webmail.co.za>,
raid-list <linux-raid@vger.kernel.org>
Subject: Re: XP RAID vs md
Date: Wed, 2 Apr 2003 17:27:31 +0200 [thread overview]
Message-ID: <20030402152731.GE7364@marowsky-bree.de> (raw)
In-Reply-To: <3E8AD562.6090707@webmail.co.za>
On 2003-04-02T14:19:46,
Vladimir Milovanovic <vlad@webmail.co.za> said:
> Wow... I hope that one of the maintainers will comment on this, I didn't
> even know that XP had a sw RAID implementation. Up to 100% more on read
> and 60% more on write is quite a significant margin. Is there anything
> in favour of the md driver if this is true?
I've not really checked these numbers yet, so take the following with a grain
of salt.
However, with RAID1 for example, I got approximately twice the read speed and
95% of the write speed (compared to just using a single disk).
I have a really hard time imagining a 100% read boost; that would simply
exceed disk bandwidth, and 60% writes - how should that work?
I'm not claiming md is perfect or the fastest imaginable solution, but it is
rather close to theoretical disk bandwidth. A two digit percentage performance
improvement just can't be done.
Sincerely,
Lars Marowsky-Brée <lmb@suse.de>
--
SuSE Labs - Research & Development, SuSE Linux AG
"If anything can go wrong, it will." "Chance favors the prepared (mind)."
-- Capt. Edward A. Murphy -- Louis Pasteur
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next prev parent reply other threads:[~2003-04-02 15:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-02 12:19 XP RAID vs md Vladimir Milovanovic
2003-04-02 15:27 ` Lars Marowsky-Bree [this message]
2003-04-02 20:35 ` Scott McDermott
2003-04-04 8:45 ` Illtud Daniel
2003-04-04 9:21 ` Vladimir Milovanovic
2003-04-04 9:46 ` Illtud Daniel
-- strict thread matches above, loose matches on Subject: below --
2003-04-02 15:17 Rechenberg, Andrew
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