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Date:      Mon, 12 Oct 2009 15:55:00 +0100
From:      krad <kraduk@googlemail.com>
To:        Andriy Gapon <avg@icyb.net.ua>
Cc:        freebsd-fs@freebsd.org, freebsd-current@freebsd.org
Subject:   Re: zfs boot vs loader
Message-ID:  <d36406630910120755k464eddbaled03810a723c9e30@mail.gmail.com>
In-Reply-To: <4AD3220B.5030502@icyb.net.ua>
References:  <4AD3220B.5030502@icyb.net.ua>

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2009/10/12 Andriy Gapon <avg@icyb.net.ua>

>
> I am using ZFS for boot-and-root filesystem. gptzfsboot is used for
> bootstrapping,
> if that matters.
> Maybe the following is some kind of a pilot error, but I think that I see a
> problem with selecting a different kernel using loader prompt.
> That is, I escape to a loader prompt from boot menu. There I do 'unload'.
> Then I
> 'load' a different kernel, opensolaris.ko and zfs.ko. Then I 'boot'. Then
> root
> mounting inevitably fails because ZFS root filesystem can not be found.
>
> This is an unexpected result for me.
> I wonder if something important for ZFS get unloaded when I unload
> preloaded
> kernel and modules. Perhaps I have to manually re-load zpool.cache?
>
> This happens with recent CURRENT, amd64.
> What's strange is that I think that I can switch kernels from loader prompt
> without any problems when using RELENG_7 and UFS-boot-plus-ZFS-root
> approach.
>
> --
> Andriy Gapon
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> http://lists.freebsd.org/mailman/listinfo/freebsd-current
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>


before you boot the kernels check the values of the following are still set

eg

vfs.root.mountfrom="zfs:system/root"
vfs.root.mountfrom.options=rw



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