linux-kernel - Re: Future of md multipath

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Message-ID: <20090305130017.GA1696@piper.oerlikon.madduck.net>
Date:	Thu, 5 Mar 2009 14:00:17 +0100
From:	martin f krafft <madduck@...ian.org>
To:	Neil Brown <neilb@...e.de>
Cc:	Christoph Hellwig <hch@....de>, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Future of md multipath

also sprach Neil Brown <neilb@...e.de> [2009.03.05.0349 +0100]:
> I'm in favour of deprecating it.  Whenever I hear of people using it I
> suggest dm-multipath, but there could people I don't here about.
> I think the upcoming mdadm-3.0 will need a compile-time option to
> enable multipath, so people will only get it if they really really
> want it.

How do you propose a distro to deal with this? Keep it enabled for
a certain time (with a deprecation warning?) and then just to close
the doors on users who still need it?

How long will you support it after deprecation?

I understand that dm-multipath is more favourable, but unless
there's a riskless way to convert mdadm multipath into dm-multipath
on old systems, I don't think we have the option of deprecating it,
unless deprecation lasts for several years.

-- 
 .''`.   martin f. krafft <madduck@d.o>      Related projects:
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