From mboxrd@z Thu Jan 1 00:00:00 1970 From: martin f krafft Subject: Re: Future of md multipath Date: Fri, 6 Mar 2009 16:17:15 +0100 Message-ID: <20090306151715.GD6030@lapse.rw.madduck.net> References: <20090303180433.GA27569@lst.de> <18863.15828.150450.275712@notabene.brown> <20090305130017.GA1696@piper.oerlikon.madduck.net> <18864.46425.242906.213929@notabene.brown> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="osDK9TLjxFScVI/L" Return-path: Content-Disposition: inline In-Reply-To: <18864.46425.242906.213929@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-raid.ids --osDK9TLjxFScVI/L Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable also sprach Neil Brown [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. >=20 > 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? --=20 .''`. martin f. krafft 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 =20 god is dead. -- nietzsche nietzsche is dead. -- god nietzsche is god. -- dead --osDK9TLjxFScVI/L Content-Type: application/pgp-signature; name="digital_signature_gpg.asc" Content-Description: Digital signature (see http://martin-krafft.net/gpg/) Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkmxPnsACgkQIgvIgzMMSnUQcQCff50ZnDoBq+g8Ek7c3O47GmPH vKcAnRIu96ezlsqesT+c4i7mJOH8Sn5k =F9q5 -----END PGP SIGNATURE----- --osDK9TLjxFScVI/L--