From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kurt Garloff Subject: Re: [PATCH] sd_many done right (1/5) Date: Sat, 27 Jul 2002 00:32:24 +0200 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <40468.5903377414$1027723030@news.gmane.org> References: <20020726154533.GD19721@nbkurt.etpnet.phys.tue.nl> <20020726165411.GI19721@nbkurt.etpnet.phys.tue.nl> <20020726175027.GC2746@clusterfs.com> <20020726185545.B18629@infradead.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="S0GG+JvAI2G0KxBG" Return-path: Content-Disposition: inline In-Reply-To: <20020726185545.B18629@infradead.org> List-Id: linux-scsi@vger.kernel.org To: Christoph Hellwig , Alexander Viro , Linux SCSI list , Linux kernel list , Marcelo Tosatti --S0GG+JvAI2G0KxBG Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi Christoph, Andreas, On Fri, Jul 26, 2002 at 06:55:45PM +0100, Christoph Hellwig wrote: > On Fri, Jul 26, 2002 at 11:50:27AM -0600, Andreas Dilger wrote: > > Actually, one interesting aspect of the EVMS vs. device-mapper argument > > going on that has totally been missed is that EVMS can do management of > > ALL disk block devices. >=20 > That's only natural as it try to duplicate the whole Linux block layer. > But it's everything but a good idea. I won't go into that discussion ... Duplicating the Linux block layer is certainly not such a good idea as the block layer is getting really nice nowadays. But I have no idea to what extent something like this is done in EVMS. But the idea of having a number of majors assigned to disks, no matter what the driver below is looks certainly like a good idea. With the current approach, we'll need way too many majors, even if we'd have some more bits in the future. Why not have a pool of disk majors and sd, hd, dasd, rd (DAC960), the IDE-Raids, and ... allocate some of these as needed. driverfs + some userspace tool will be needed to provide a consistent view on them and to handle the permissions. Fortunately, disk devs tend to all have the same perms, so we can start before this is addressed to its full extent. Regards, --=20 Kurt Garloff Eindhoven, NL GPG key: See mail header, key servers Linux kernel development SuSE Linux AG, Nuernberg, DE SCSI, Security --S0GG+JvAI2G0KxBG Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (GNU/Linux) iD8DBQE9Qc34xmLh6hyYd04RArTyAJ0Uig6iiCc+2TVB41EQJuZJ3aJ22QCgj9X6 U9rTa6iLaVo8Tis9ryARyBc= =NRTi -----END PGP SIGNATURE----- --S0GG+JvAI2G0KxBG--