From owner-freebsd-fs@freebsd.org  Wed Sep 19 14:18:41 2018
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To: freebsd-fs@freebsd.org
From: David Chisnall <theraven@freebsd.org>
Subject: Fixing vdev name
Message-ID: <fe377835-a45a-22e1-e80e-bf4d1e87664b@theravensnest.org>
Date: Wed, 19 Sep 2018 15:16:16 +0100
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Hello the list,

I have a VM that uses ZFS with a pair of striped devices.  The first is 
a partition on the root disk, created by the installer.  When this was 
too small, I added another device (da1) and told the pool to expand to 
use it (no redundancy, because the underlying storage for the VM images 
provides that).  After a reboot, I can no longer boot the system. 
Booting from the install CD and attempting to import the pool, it 
correctly identifies da0p4 as one of the devices, but gives me a long 
number instead of da1.

How do I fix this so that the pool again points to da1?

David