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Re: performance over multiple disks

To: Ragnar@xxxxxxxx, Kj@xxxxxxxx
Subject: Re: performance over multiple disks
From: Chris Wedgwood <cw@xxxxxxxx>
Date: Thu, 31 Oct 2002 11:47:03 -0800
Cc: James Rich <james@xxxxxxxxxxxxx>, XFS mailing list <linux-xfs@xxxxxxxxxxx>
In-reply-to: <20021031204233.Q30076@xxxxxxxxxxx>
References: <Pine.LNX.4.44.0210311039310.21908-100000@xxxxxxxxxxxxxxxxxxxx> <20021031204233.Q30076@xxxxxxxxxxx>
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On Thu, Oct 31, 2002 at 08:42:33PM +0100, Ragnar Kj?rstad wrote:

> If you do the same calculations when multiple operations are going
> on at the same time you'll find that if you're reading 10 files from
> 10 disks it's going to be a lot quicker if the files are _not_
> spread out.

More disks -> more heads -> lower average seek time.

If you experiment with this, you'll find eads over multiple disks and
stripping is almost *always* faster.  RAID4/RAID5 will have slower
writes obviously though.


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