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performance over multiple disks

To: XFS mailing list <linux-xfs@xxxxxxxxxxx>
Subject: performance over multiple disks
From: James Rich <james@xxxxxxxxxxxxx>
Date: Thu, 31 Oct 2002 10:49:47 -0700 (MST)
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On another mailing list a debate arose about performance over a single
disk vs. multiple disks.  It goes something like this:

Suppose you have a 6 megabyte file stored on disk.  Would it be read
faster if it were stored contiguously on a single disk or spread over
multiple (say 4) disks?

It seems to me that as you get smaller it is faster for the single disk
case (remember that we are assuming the file is stored contiguously - not
spread all over the disk).  At some size it seems natural that it would be
faster if the file were spread over multiple disks.  Can anyone comment on
how XFS would perform?  I don't have the equipment available to test this,
but I'm not too concerned with actual benchmark numbers.  Mostly I'm just
wondering if I understand the filesystem correctly.

James Rich

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