Date: Wed, 15 Aug 2012 11:16:21 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-hackers@freebsd.org Cc: Garrett Cooper <yanegomi@gmail.com> Subject: Re: GPT boot from 2nd. disk fails Message-ID: <201208151116.21461.jhb@freebsd.org> In-Reply-To: <CAGH67wRf9gpJen%2BVC6OzePLDwWE3dC_T9Ve6DPKs=12N6VuMMA@mail.gmail.com> References: <E1T1YwR-000Gfo-O4@kabab.cs.huji.ac.il> <CAGH67wRf9gpJen%2BVC6OzePLDwWE3dC_T9Ve6DPKs=12N6VuMMA@mail.gmail.com>
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On Wednesday, August 15, 2012 4:46:28 am Garrett Cooper wrote: > On Wed, Aug 15, 2012 at 1:27 AM, Daniel Braniss <danny@cs.huji.ac.il> wrote: > > hi, > > this host has to disks: > > sa0> gpart show > > => 34 976773101 ada0 GPT (465G) > > 34 128 1 freebsd-boot (64k) > > 162 4194304 2 freebsd-ufs (2.0G) > > 4194466 33554432 3 freebsd-swap (16G) > > 37748898 939024237 4 freebsd-zfs (447G) > > > > => 34 976773101 ada1 GPT (465G) > > 34 128 1 freebsd-boot (64k) > > 162 4194304 2 freebsd-ufs [bootme] (2.0G) > > 4194466 8388608 3 freebsd-swap (4.0G) > > 12583074 964190061 4 freebsd-zfs (459G) > > > > but no amount of magic will cause boot from the second disk, it will always > > boot from the first disk. > > > > any insights? > > Use boot0cfg -s 5 (untested with GPT disks)? Will not work with GPT disks. They use /boot/pmbr to boot, not /boot/boot0. If you can get your BIOS to explicitly boot ada1 from the start via a BIOS setting, that should work. Another option would be to break into gptboot's prompt (similar to breaking into boot2) aud typing in 'ad1p2:/boot/loader' or some such. If that works you should even be able to write that to /boot.config on ada0p2's filesystem. -- John Baldwin
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