Fwd: Re: Can ZFS boot from other than the root of a pool?

Forgot to include the list in the original reply.

Typos and terseness brought to you by the LG G2 running SlimKat.
---------- Forwarded message ----------
From: "Freddie Cash" <[e-mail]>
Date: Mar 20, 2014 7:17 AM
Subject: Re: Can ZFS boot from other than the root of a pool?
To: "Karl Denninger" <[e-mail]>
Cc:


On Mar 20, 2014 7:13 AM, "Karl Denninger" <[e-mail]> wrote:
>
> For a number of reasons having to do with backup strategy I want to mount
a ZFS root from "poolname/root" instead just "poolname."
>
> That works ok; I can set in /boot/loader.conf:
> vfs.root.mountfrom="zfs:zroot/root"
>
> But -- I cannot actually boot from there.  Unless the /boot directory is
in zfs:/zroot the system cannot find it, and I see no obvious way to
"teach" the loader that I want it to look in the filesystem under the top
level.
>
> This isn't a terrible pain as I can simply mount zroot on /mnt and then
copy zroot/root/boot over to zroot/boot whenever I make changes to the
kernel or boot environment (which is infrequent) but I'm wondering if I'm
missing something that would make booting directly from the filesystem
where root is specified to be possible.
>
> (Obviously until the loader.conf file is found the system doesn't know
where root is either, so this does look at first blush to be a "chicken and
egg" problem.)

Read up on Boot Environments, install the beadm port, set the bootfs
property on the pool itself, and you'll be off to the races.
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