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Date: Thu, 26 Mar 2009 16:46:19 +0000
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From: Buganini <buganini@gmail.com>
To: Philipp Wuensche <cryx-freebsd@h3q.com>
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Cc: freebsd-current@freebsd.org
Subject: Re: unable to boot ZFS with gptzfsboot from an exported zpool
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It need /boot/zfs/zpool.cache to locate zfs IIRC,
and http://blogs.freebsdish.org/lulf/2008/12/16/setting-up-a-zfs-only-system/
export & import zpool to make /boot/zfs/zpool.cache up-to-date,
so I guess exporting zpool delete the record in zpool.cache,
then it can't locate your zpool.

--Buganini