Rescuing a GPT ZFS boot setup
amoran at yahoo.com
Fri Sep 20 02:35:00 UTC 2013
On Sep 19, 2013, at 9:28 AM, John-Mark Gurney <jmg at funkthat.com> wrote:
> Andy Moran wrote this message on Thu, Sep 19, 2013 at 08:12 -0700:
>> On Sep 19, 2013, at 6:58 AM, Volodymyr Kostyrko <c.kworr at gmail.com> wrote:
>>> 19.09.2013 16:43, Andrew Moran wrote:
>>>> Alas, that did not work. But it does look to be BIOS related.
>>>> I think this new system has a UEFI bios.
>>>> I just read from https://wiki.freebsd.org/UEFI:
>>>> * Partitions not seen. When using GPT, FreeBSD will create a protective MBR. This MBR has one partition entry covering the whole disk. FreeBSD marks this partition active. This causes at least some UEFI implementations to ignore the GPT. To fix this the partition needs to be marked inactive.
>>>> * Filesystem not seen. FreeBSD's FAT32 code appears to sometimes create filesystems that the UEFI code can't properly read. If the filesystem is small enough, use FAT16 or FAT12 instead.
>>>> I think this may be my issue. But 9.1 LiveCD does boot and I can see the data once booted, so there must be a way to fix the boot loader on the drive to work.
>>> Good catch. The fix landed in stable not so long ago (http://svnweb.freebsd.org/base?view=revision&revision=255017) so you wouldn't find it in 9.2 either. Can you try this:
>>> gpart unset -a active ada0
>> It says 'active' is an invalid attribute. This matches what gpart mangpage says under ATTRIBUTES .. it doesn't list 'active' as an attribute for the GPT partition scheme (but it does for other schemes). I did try to unset 'bootme' but that did not help either.
>> Do I need the newer version of gpart to be able to unset or set it?
> You could try the new 10-ALPHA1 LiveCD to unset it..
WIth the 10-ALPHA2 LiveCD, I get:
gpart: attrib 'active': Device not configured
I can set/unset the bootme attribute and I can do: gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i ada0
But neither seems to get me out of my jam -- the UEFI doesn't seem to see it as a bootable disk.
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