From owner-freebsd-stable@freebsd.org  Sat Apr 28 12:46:48 2018
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To: "stable@freebsd.org" <stable@freebsd.org>
From: Willem Jan Withagen <wjw@digiware.nl>
Subject: ZFS: Can't find pool by guid
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Date: Sat, 28 Apr 2018 14:46:44 +0200
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Hi,

I upgraded a server from 10.4 to 11.1 and now al of a sudden the server 
complains about:
	ZFS: Can't find pool by guid
And I end up in the boot prompt:

lsdev gives disk0 withe on p1 the partion that the zroot is/was.

This is an active server, so redoing install and stuf is nog going to be 
real workable....

So how do I get this to boot?

Thanx,
--WjW