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Date: Wed, 10 Jul 2013 12:34:23 -0400
Subject: zfs can't mount /usr after 9.1-release upgrade
From: Tom Worster <fsb@thefsb.org>
To: <freebsd-questions@FreeBSD.ORG>
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Thread-Topic: zfs can't mount /usr after 9.1-release upgrade
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a freebsd box doesn't boot normally since upgrading from 9.1-rc3 to
9.1-release. it boots to the point that /usr is mounted, then errors

"mount: /usr: unknown special file or file system"

if i boot to single user, zfs mount -a manually, then it comes up fine.

what function key do i gotta press to make that not happen again?

tom