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From: Hans Petter Selasky <hselasky@c2i.net>
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Subject: Re: ZFS + usb in trouble? [PATCHED]
Date: Sun, 27 Jan 2013 19:05:41 +0100
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Cc: Alexander Nedotsukov <bland@freebsd.org>, freebsd-usb@freebsd.org
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Hi,

Can you try this patch:

http://svnweb.freebsd.org/changeset/base/245995

It fixes the issue for me. Looks like I overlooked a corner case computing the 
DMA addresses. Thanks for reporting!

zpool status
  pool: tank
 state: ONLINE
  scan: none requested
config:

	NAME        STATE     READ WRITE CKSUM
	tank        ONLINE       0     0     0
	  raidz1-0  ONLINE       0     0     0
	    da0     ONLINE       0     0     0
	    da1     ONLINE       0     0     0
	    da2     ONLINE       0     0     0

errors: No known data errors


--HPS