From owner-freebsd-fs@FreeBSD.ORG  Mon Nov 24 18:49:39 2014
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Date: Mon, 24 Nov 2014 13:49:38 -0500
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Subject: ZDB -Z?
From: Zaphod Beeblebrox <zbeeble@gmail.com>
To: freebsd-fs <freebsd-fs@freebsd.org>
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I'm reading about someone else's recovery of files from a damaged ZFS
partition.  He claims to have added (possibly to opensolaris or whatnot) an
argument to zdb '-Z' ... which operates somewhat like -R, but which
highlights what parts of the region are on what physical disks, and which
are parity.

Has anyone patched this into FreeBSD?