From: Bernd Eckenfels <ecki-news2002-04@lina.inka.de>
To: linux-kernel@vger.kernel.org
Subject: Re: raid1 performance
Date: Wed, 1 May 2002 23:23:23 +0200 [thread overview]
Message-ID: <E1731ZL-0005Bl-00@sites.inka.de> (raw)
In-Reply-To: <20020501130127.A10936@borg.org>
In article <20020501130127.A10936@borg.org> you wrote:
> 1. Does the OS even know where the heads are in a modern IDE disk?
> 2. Is "closer" any more finely grained than a binary
> positioned/not-positioned?
> And I guess another question: How much does RAID 1 help and under what
> kinds of usage?
No, you just distribute the ready round robin, this means each disk has only
half the seeks it had before. As long as you do not spread continous blocks
(readahead) stats are good you actually reduce overall seeks. This helps
actually even if no seek is involved because of the fact that you need to
wait for the begin of a track to read it.
Greetings
Bernd
next prev parent reply other threads:[~2002-05-01 21:23 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-30 12:23 Jaime Medrano
2002-04-30 12:38 ` Arjan van de Ven
2002-04-30 14:21 ` Kent Borg
2002-05-01 16:35 ` Jakob Østergaard
2002-05-01 17:01 ` Kent Borg
2002-05-01 17:16 ` Justin Cormack
2002-05-01 21:23 ` Bernd Eckenfels [this message]
2002-05-02 16:37 ` Jakob Østergaard
2002-06-29 0:01 ` Bernd Eckenfels
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