Message-ID: <40624235.30108@pobox.com>
Date: Wed, 24 Mar 2004 21:21:41 -0500
From: Jeff Garzik <jgarzik@pobox.com>
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To: Neil Brown <neilb@cse.unsw.edu.au>
CC: "Justin T. Gibbs" <gibbs@scsiguy.com>, linux-raid@vger.kernel.org,
       linux-kernel@vger.kernel.org
Subject: Re: "Enhanced" MD code avaible for review
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Neil Brown wrote:
> Choice is good.  Competition is good.  I would not try to interfere
> with you creating a new "emd" driver that didn't interfere with "md". 
> What Linus would think of it I really don't know.  It is certainly not
> impossible that he would accept it.

Agreed.

Independent DM efforts have already started supporting MD raid0/1 
metadata from what I understand, though these efforts don't seem to post 
to linux-kernel or linux-raid much at all.  :/


> However I'm not sure that having three separate device-array systems
> (dm, md, emd) is actually a good idea.  It would probably be really
> good to unite md and dm somehow, but no-one seems really keen on
> actually doing the work.

I would be disappointed if all the work that has gone into the MD driver 
is simply obsoleted by new DM targets.  Particularly RAID 1/5/6.

You pretty much echoed my sentiments exactly...  ideally md and dm can 
be bound much more tightly to each other.  For example, convert md's 
raid[0156].c into device mapper targets...  but indeed, nobody has 
stepped up to do that so far.

	Jeff


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