From: Andy Smith <andy@lug.org.uk>
To: linux-raid@vger.kernel.org
Subject: Re: Mustn't be RAID 1 and 0 read-performance be similar?
Date: Thu, 9 Aug 2007 14:13:10 +0000 [thread overview]
Message-ID: <20070809141310.GM27603@bitfolk.com> (raw)
In-Reply-To: <735D322AED9CD711BE53000476917CD00281A96B@NT-SERVER-5>
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Hi Florian,
On Thu, Aug 09, 2007 at 09:15:53AM +0200, Rustedt, Florian wrote:
> On RAID 1, it is possible, to read two blocks in parallel to speed up, too.
>
> I tried to measure this some weeks ago, but i couldn't get over the
> read-performance of a single disk on my raid 1, so that means, that the
> software-raid does not use this easy possibility to speed up?
Were you doing this with a single thread or multiple threads? My
understanding is that for RAID-1, a single thread's IO will come
from whichever component is knwon to be closest to where it needs to
start reading from.
If that's not correct I'd love to hear the reality!
Cheers,
Andy
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next prev parent reply other threads:[~2007-08-09 14:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-09 7:15 Mustn't be RAID 1 and 0 read-performance be similar? Rustedt, Florian
2007-08-09 14:13 ` Andy Smith [this message]
2007-08-09 21:37 ` Bill Davidsen
2007-08-13 14:49 ` Mario 'BitKoenig' Holbe
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