Date: Mon, 13 May 2013 11:47:24 -0400 From: Chris Ross <cross+freebsd@distal.com> To: Jeremy Chadwick <jdc@koitsu.org> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org> Subject: Re: Reinstalling boot blocks on a ZFS-only system Message-ID: <B9B6D3F7-44F4-4F55-9172-1A7C9D32904B@distal.com> In-Reply-To: <20130513031742.GA75801@icarus.home.lan> References: <A6940C2F-17B4-4ECF-85B6-BA8CB335486E@distal.com> <20130512205837.GA69605@icarus.home.lan> <28B5181C-E185-40E5-90EC-9600297BE590@distal.com> <20130513031742.GA75801@icarus.home.lan>
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On May 12, 2013, at 23:17 , Jeremy Chadwick wrote:
> On Sun, May 12, 2013 at 10:20:26PM -0400, Chris Ross wrote:
>> In the past, I've found I've been unable to install all of the bootblocks if I
>> boot from the ZFS root. When booting from a cd, the basic:
>>
>> gpart bootcode -p ${bootdir}/zfsboot ${disk}
>> dd if=${bootdir}zfsloader of=/dev/${disk}a bs=512 oseek=1024 conv=notrunc,sync
>>
>> works. But, if I boot from ZFS, then I can't dd anything into the front of the
>> drives. Right now, the problem after booting from the CD, is trying to mount
>> a read/write filesystem (mfs, or the like) so that I can scp the bootblocks onto the
>> system and install them. But, I eventually found the command I'd lost. so I
>> think I'm alright. Thanks...
>
> What does "unable to install" mean? What output/error do you get? I am
> going to assume you get EPERM (Operation not permitted), which would be
> caused by GEOM's "preventive foot-shooting" (keep reading).
>
> Is there some reason you're sticking with the MBR scheme instead of GPT?
I apologize for all of the noise on the list. I failed to mention the important detail,
which is that I'm working on a sparc64 system, so it's all VTOC8, not MBR nor
GPT.
But as noted, I was able to mount an MBR an accomplish what I'd intended
when booting from a CD-R. Thanks.
- Chris
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