freebsd / gpt boot

[Rolf G Nielsen]

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)?

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

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
> 
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