No ZFS when loading modules from loeader prompt

Peter Jeremy peter at
Fri Feb 22 00:38:36 UTC 2013

On Wed, Feb 20, 2013 at 7:05 AM, O. Hartmann <ohartman at> wrote:
> At the loader prompt, I need to unload the buggy kernel and load the old
> working one via
> load /boot/kernel.old/kernel
> Then I load also the ZFS related modules
> load /boot/kernel.old/opensolaris.ko
> load /boot/kernel.old/zfs.ko
> Issuing boot at the end of that stage boots the kernel - the old one
> -successfully - but there is no working ZFS and no ZFS volume gets
> mounted although the rc.conf is executed correctly.
> What am I doing wrong at that point? Why isn't ZFS run and mount properly?

Last time I ran into this problem, the issue was that "unload" also
unloaded the zpool.cache file and the ZFS code relied on that to find
the kernel.  I don't recall what the workaround was.

On 2013-Feb-20 08:17:46 -0800, Freddie Cash <fjwcash at> wrote:
>Sounds like a perfect use case for Boot Environments.  Create a new BE,
>install the new kernel into it, set it as the default, reboot.  If it
>fails, you manually set the previous BE as the default, and reboot.  That
>way, your "known-good", working environment is never affected.

How do you change your BE in the loader?  Or how do you change your
BE when you can't boot?

Peter Jeremy
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