linux-kernel - Re: Future of md multipath

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Fri, 6 Mar 2009 16:17:15 +0100
From:	martin f krafft <madduck@...ian.org>
To:	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Future of md multipath

also sprach Neil Brown <neilb@...e.de> [2009.03.06.0632 +0100]:
> > 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 :-)

Goes with the territory. Debian does not need to make long term
support guarantees. They're inherent in our quality assurance,
security support, and chaotic organisation. :)

> 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.

A migration isn't possible?

> 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..

Maybe it would be possible to disable creation of new multipath
arrays, but still to support existing ones, insert the warning, and
quote a fixed deprecation date, say, 5 years into the future?

-- 
 .''`.   martin f. krafft <madduck@d.o>      Related projects:
: :'  :  proud Debian developer               http://debiansystem.info
`. `'`   http://people.debian.org/~madduck    http://vcs-pkg.org
  `-  Debian - when you have better things to do than fixing systems
 
god is dead.
    -- nietzsche
nietzsche is dead.
    -- god
nietzsche is god.
    -- dead

Download attachment "digital_signature_gpg.asc" of type "application/pgp-signature" (198 bytes)