Date: Mon, 13 Jul 2009 09:46:46 -0300 From: "Carlos A. M. dos Santos" <unixmania@gmail.com> To: Alexander Motin <mav@freebsd.org> Cc: svn-src-head@freebsd.org, Poul-Henning Kamp <phk@phk.freebsd.dk>, src-committers@freebsd.org, Scott Long <scottl@freebsd.org>, svn-src-all@freebsd.org Subject: Re: svn commit: r195534 - in head: etc/mtree include lib/libcam sbin/camcontrol share/man/man4 sys/cam sys/cam/ata sys/cam/scsi sys/conf sys/dev/advansys sys/dev/ahci sys/dev/aic7xxx sys/dev/amd sys/de... Message-ID: <e71790db0907130546xf5c79a8w143357c48cf4b7@mail.gmail.com> In-Reply-To: <4A5AC36D.1040705@FreeBSD.org> References: <37131.1247214217@critter.freebsd.dk> <4A56FC7C.8060107@samsco.org> <e71790db0907121809k3c66243fxd039fc67b41ab1d@mail.gmail.com> <4A5AC36D.1040705@FreeBSD.org>
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On Mon, Jul 13, 2009 at 2:17 AM, Alexander Motin<mav@freebsd.org> wrote: > Carlos A. M. dos Santos wrote: >> >> On Fri, Jul 10, 2009 at 5:31 AM, Scott Long<scottl@samsco.org> wrote: >>> >>> Poul-Henning Kamp wrote: >>>> >>>> In message <200907100818.n6A8I8p1011853@svn.freebsd.org>, Scott Long >>>> writes: >>>> >>>>> =A0ATA drives are accessed via 'ada' device nodes. >>>> >>>> It there a particular good reason why we insist on making this >>>> silly mistake every five years ? >>>> >>>> I am pretty sure you were around when Justin won friends by renaming >>>> the SCSI disk devices ? >>> >>> 1. I clearly stated that the name is experimental and that a change in >>> the future is possible. >> >> Well, from a user's perspective, if CD/DVD drives are to be seen as >> 'cdX', then it would make sense that hard disks were seen as daX, as >> already advertised by cam(4). > > cdX implemented by cd(4) driver in both cases uses the same SCSI command > set. In ATA case, SCSI commands are just wrapped within ATAPI PACKET > command. For disks, situation is completely different, as ATA disks have > completely different command and feature set. So da(4) is a driver for SC= SI > command set devices and ada(4) is a driver for ATA command set devices. I know, but that is the driver's perspective, not the user's perspective. --=20 My preferred quotation of Robert Louis Stevenson is "You cannot make an omelette without breaking eggs". Not because I like the omelettes, but because I like the sound of eggs being broken.
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