Date: Sat, 18 Feb 2012 22:37:03 -0800 From: Kevin Oberman <kob6558@gmail.com> To: Freddie Cash <fjwcash@gmail.com> Cc: wblock@wonkity.com, mandrews@bit0.com, 000.fbsd@quip.cz, Andriy Gapon <avg@freebsd.org>, freebsd-stable@freebsd.org, freebsd@jdc.parodius.com Subject: Re: New BSD Installer Message-ID: <CAN6yY1skQ=eO39vvbE-mLFKZb5TxXJJqtWydZOQpVBsiZpBHYw@mail.gmail.com> In-Reply-To: <CAOjFWZ5Jm9M27J=%2B2jj5b4mSyE_i1Jq2YyXBKs%2BPabrUQyiYhg@mail.gmail.com> References: <CAOjFWZ5EhGFr_Vp0%2BTRfxvgm6KZxv9QO3UfVdKurA96z3axDMQ@mail.gmail.com> <20120217.160430.406937514120319292.hrs@allbsd.org> <4F3E3000.9000206@FreeBSD.org> <20120217.232843.2212672671663755444.hrs@allbsd.org> <4F3EC8DD.6040500@FreeBSD.org> <CAOjFWZ5Jm9M27J=%2B2jj5b4mSyE_i1Jq2YyXBKs%2BPabrUQyiYhg@mail.gmail.com>
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On Fri, Feb 17, 2012 at 1:50 PM, Freddie Cash <fjwcash@gmail.com> wrote: > On Fri, Feb 17, 2012 at 1:38 PM, Andriy Gapon <avg@freebsd.org> wrote: >> And just in case: >> Unified Extensible Firmware Interface Specification Version 2.3.1, Errat= a A >> September 7, 2011 says: >> [snip] >>> Two GPT Header structures are stored on the device: the primary and the >>> backup. The primary GPT Header must be located in LBA 1 (i.e., the seco= nd >>> logical block), and the backup GPT Header must be located in the last L= BA >>> of the device. >> >> I can not see any ambiguity or openness to interpretation in this paragr= aph. > > Unless it's specified somewhere else (which is possible), in this > paragraph, "device" does not necessarily mean "physical disk". =A0"Last > LBA of the device" could be interpreted as "last LBA of the GEOM > provider". > > The beauty of GEOM is that "device" is whatever logical mapping it provid= es. > > After all, LBAs are logical addresses (it's right there in the name!), > not hardwired physical sector addresses. =A0;) =A0If they were hardwired, > then how would internal sector remapping work? =A0;) Please remember that some disks are dual-boot. FreeBSD may understand geom has the backup one block from the last LBA on the disk, but no other OS is likely to do so. Unless I am missing something, this should be a non-starter. Totally unacceptable. The backup belongs in the last and only in the last LBA on the physical disk. --=20 R. Kevin Oberman, Network Engineer E-mail: kob6558@gmail.com
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