Messages in this thread | | | From | Neil Brown <> | Date | Fri, 6 Mar 2009 16:32:09 +1100 | Subject | Re: Future of md multipath |
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On Thursday March 5, madduck@debian.org wrote: > also sprach Neil Brown <neilb@suse.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.
Always the practical one, aren't you :-)
I wonder how hard it would be to get mdadm to assemble a multipath using the 'dm' code rather than the 'md' code.... Or to get the md layer in the kernel to hook in to the dm multipath implementation.
I think it is probably worth putting in a printk now to say "You should probably be using dm-multipath". But we probably do need to leave the code there for a while longer..
NeilBrown
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