linux-kernel - Re: [dm-devel] [PATCH 13/13] dm-mpath: convert to request-based

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Message-Id: <20081028.120351.78702656.k-ueda@ct.jp.nec.com>
Date:	Tue, 28 Oct 2008 12:03:51 -0400 (EDT)
From:	Kiyoshi Ueda <k-ueda@...jp.nec.com>
To:	nikanth@...il.com
Cc:	dm-devel@...hat.com, jens.axboe@...cle.com, agk@...hat.com,
	James.Bottomley@...senpartnership.com, j-nomura@...jp.nec.com,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	knikanth@...e.de, k-ueda@...jp.nec.com
Subject: Re: [dm-devel] [PATCH 13/13] dm-mpath: convert to request-based

Hi Nikanth,

On Fri, 24 Oct 2008 13:25:33 +0530, "Nikanth K" wrote:
> On Fri, Sep 12, 2008 at 8:17 PM, Kiyoshi Ueda wrote:
> > This patch converts dm-multipath target to request-based from bio-based.
> 
> Can we keep both the bio-based as well as request-based dm-multipath?

Why do you want to keep bio-based dm-multipath?
In the realistic environment, dm-multipath is usually the bottom
of the stacking devices.  So I think existing working configurations
are still possible with request-based dm-multipath.

If we keep both types of multipath targets, maintenance cost would
be doubled and additional user interface might be needed to specify
which type is used.  I can't see any major benefit worth paying
the cost of keeping bio-based dm-multipath.

I know dm developers sometimes use linear/error maps under multipath
just for testing purpose.  If that is your requirement, I can make
request-based targets for linear and error (e.g. named like linear_rq
and error_rq).

Thanks,
Kiyoshi Ueda
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