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Date: Tue, 2 Apr 2002 16:52:44 -0800
From: Mike Fedyk <mfedyk@matchmail.com>
To: Mark Cooke <mpc@star.sr.bham.ac.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Raid5 resync slow with one linear array
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On Tue, Apr 02, 2002 at 06:35:29AM +0100, Mark Cooke wrote:
> Hi Mike,
> 
> Have you checked individual transfer rates to the drives / md devices ?

Each drive transfers 18-20MB/sec, and all have been tested with badblocks -w.

> 
> I saw (non-reproducible unfortunately) a bad-transfer rate between one 
> of my drives in an ide raid setup, where the drive was only pushing ~ 
> 2MB/sec, even after being explictly zapped with hdparm.  A power cycle 
> fixed it, and it hasn't happenned since.
> 

Hmm, I don't think I'm dealing with bad hardware.  All are SCA SCSI and tested.

> Did you try building it with different chunk sizes ?
>

No, my root filesystem is on this array.  I think 32k chunks are ok.

Mike
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