Date: Sun, 28 Jun 2009 08:47:43 +0930 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: freebsd-current@freebsd.org Cc: scottl@freebsd.org, Alexander Motin <mav@freebsd.org>, Kamigishi Rei <spambox@haruhiism.net> Subject: Re: RFC: ATA to CAM integration patch Message-ID: <200906280847.59316.doconnor@gsoft.com.au> In-Reply-To: <4A462A7A.20005@haruhiism.net> References: <4A4517BE.9040504@FreeBSD.org> <20090627141412.GN31709@acme.spoerlein.net> <4A462A7A.20005@haruhiism.net>
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--nextPart19173528.ozoyCsvDn6 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Sat, 27 Jun 2009, Kamigishi Rei wrote: > Hello, hope you're having a nice day, > > Ulrich Sp=C3=B6rlein wrote: > > I, personally, think this is not very good idea. People are used to > > CAM-devices getting enumerated as da0, da1, etc. All the > > documentation talks about ad0 for ATA and da0 (plus camcontrol) for > > SCSI, USB, Firewire devices. We also have fd0 and cd0 and should > > stick to two-letter-plus-number codes. So either make them all ad0 > > or da0. I'd vote for the latter, as that is what Linux is doing > > (more or less) and people are already familiar with USB drives or > > new SATA drives showing up as "SCSI drives, so they get the SCSI > > names". > > This poses the question of daXX enumeration order. I've already had > some 'fun' with an IBM server which has an LVD/320 SCSI controller. > While the controller's bus was enumerated properly, somehow if you > attach an USB mass storage device before the system boot that said > mass storage could suddenly appear earlier than one of the SCSI disks > (that was on 7.0-RELEASE) thus breaking the boot process sometimes > (when it appeared as da0). 7.2 has UFSID in GENERIC so you can mount your disks that way which is=20 non-ambiguous. Unfortunately you can't specify swap this way because it has no ID, I=20 don't know how hard it would be to add such a thing (which would=20 require a mkswap or somesuch, and modification to the dump & swap=20 code..) =2D-=20 Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C --nextPart19173528.ozoyCsvDn6 Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.11 (FreeBSD) iD8DBQBKRqin5ZPcIHs/zowRAqgIAKCKFJhhsT3oDd5kMe5YhKuleQLfbgCgq41k sBBb/9HN2Z8SF65bD6hkuiE= =OdYh -----END PGP SIGNATURE----- --nextPart19173528.ozoyCsvDn6--
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