freebsd / gpt boot

[Robert Noland]

On Tue, 2009-12-15 at 17:11 -0500, Adam Jacob Muller wrote:
> On Dec 14, 2009, at 10:46 AM, Robert Noland wrote:
> 
> > On Sun, 2009-12-13 at 23:21 +0100, Rolf G Nielsen wrote:
> >> Adam Jacob Muller wrote:
> >>> Hi,
> >>> I'm trying to setup a system with a very large RAID array (total ~10TB), I would ideally like to have the system boot directly off that 10TB array, so i'm trying to get the system setup with GPT but running into an issue.
> >>> 
> >>> 
> >>> The initial pre-loader (boot0 I think? -- i'm not sure what this is called) is unable to find loader at /boot/loader nor can it load /boot/kernel/kernel
> >>> 
> >> 
> >> Is the partitioning done correctly (have you created a small boot 
> >> partition, 15 sectors is enough for booting from ufs, but the tutorials 
> >> I've found deal mainly with booting from zfs and they recommend 128 
> >> sectors to make future bootcode changes easier)?
> > 
> > You will need to be doing all of this from a current 8-STABLE.  One bug
> > in dealing with larger zfs raidz volumes was fixed and made it into 8.0.
> > Another, which deals with GPT/ZFS and large volumes did not make it and
> > only exists in 8-STABLE, iirc.  Also, with the gptzfsboot code from
> > -STABLE, it will request to load /boot/zfsloader by default (and
> > LOADER_ZFS_SUPPORT is no longer required).
> > 
> >> gpart add -b 34 -s 128 -t freebsd-boot -i 1 da0
> >> 
> >> Have you embedded the correct boot code?
> >> 
> >> gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 da0
> >> (for booting from ufs).
> >> 
> >> or
> >> 
> >> gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 da0
> >> (for booting from zfs).
> >> 
> >> You may also need to set it active by
> >> 
> >> gpart set -a active -i 1 da0
> > 
> > The above step is no longer needed on -STABLE, the pmbr will be marked
> > active when you install bootcode.
> 
> Robert,
> Do either of these bugs affect GPT/UFS, which is what I am using here.

I thought that one of them was relevant, but looking back at the patch,
I believe that it only impacted gpt + zfs.

robert.

> These bugs are affecting the actual older versions of the tools (IE using the gpart from an 8.0-pre or earlier could cause issues like this)?
> 
> Also, perhaps not coincidentally, booting the FreeBSD memstick image produces the same error (boot0 can't find loader).
> 
> 
> -Adam
> 
> > 
> > robert.
> > 
> >> And of course, substitute your arrays device node for da0 in my examples.
> >> 
> >>> Copying /boot/loader to /loader allows me to enter /loader at the "boot:" prompt and the loader will load, however, its unable to load the kernel.
> >>> 
> >>> If I do an "ls" at the loader prompt I can see boot listed as a directory (with a "d" before it)
> >>> Trying to do "ls boot" inexplicably it says "boot: not a directory"
> >>> 
> >>> re-applying my /boot/loader.conf settings (for some reason vfs.root.mountfrom=ufs:/dev/label/root is required, or else I get a mountroot>) and then:
> >>> load /kernel
> >>> boot
> >>> 
> >>> does work, and lets the system boot normally and everything is as expected (/boot is a directory etc).
> >>> 
> >>> Anyone have any ideas about either of these things (the vfs.root.mountfrom is minor i guess but i'm curious if they are related?)
> >>> 
> >>> Thanks in advance,
> >>> 
> >>> -Adam
> >>> 
> >>> _______________________________________________
> >>> freebsd-stable at freebsd.org mailing list
> >>> http://lists.freebsd.org/mailman/listinfo/freebsd-stable
> >>> To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"
> >>> 
> >>> 
> >>> 
> >> 
> >> _______________________________________________
> >> freebsd-stable at freebsd.org mailing list
> >> http://lists.freebsd.org/mailman/listinfo/freebsd-stable
> >> To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"
> > -- 
> > Robert Noland <rnoland at FreeBSD.org>
> > FreeBSD
> > 
> > _______________________________________________
> > freebsd-stable at freebsd.org mailing list
> > http://lists.freebsd.org/mailman/listinfo/freebsd-stable
> > To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"
> 
-- 
Robert Noland <rnoland at FreeBSD.org>
FreeBSD