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Re: Fastest Chunk Size w/XFS For MD Software RAID = 1024k

from [Justin Piszcz] [Permanent Link][Original]
To: David Chinner <dgc@xxxxxxx>
Subject: Re: Fastest Chunk Size w/XFS For MD Software RAID = 1024k
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Date: Thu, 28 Jun 2007 04:07:45 -0400 (EDT)
Cc: linux-raid@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, Alan Piszcz <ap@xxxxxxxxxxxxx>
In-reply-to: <20070628050837.GG989688@xxxxxxx>
References: <Pine.LNX.4.64.0706271918010.29111@xxxxxxxxxxxxxxxx> <Pine.LNX.4.64.0706271920350.29111@xxxxxxxxxxxxxxxx> <20070628050837.GG989688@xxxxxxx>
Sender: xfs-bounce@xxxxxxxxxxx 
10 disks total.

Justin.

On Thu, 28 Jun 2007, David Chinner wrote:


On Wed, Jun 27, 2007 at 07:20:42PM -0400, Justin Piszcz wrote:

For drives with 16MB of cache (in this case, raptors).


That's four (4) drives, right?

If so, how do you get a block read rate of 578MB/s from
4 drives? That's 145MB/s per drive....

Cheers,

Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
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