From owner-freebsd-fs@FreeBSD.ORG  Wed Aug  8 16:09:04 2012
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From: "Brian Gold" <bgold@simons-rock.edu>
To: "'Freddie Cash'" <fjwcash@gmail.com>
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Date: Wed, 8 Aug 2012 12:08:53 -0400
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Cc: freebsd-fs@freebsd.org
Subject: RE: undoing zfs deduplication
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> Yes, that is the only option for "un-deduping" a filesystem.
>=20
> zfs send/recv from the deduped filesystem to one with dedup=3Doff.  =
Then delete the deduped filesystem.
>=20
> Note:  a "zfs destroy" will use a lot of RAM as it has to go through =
an update all the DDT entries.  You may have to manually delete
> individual snapshots, and then manually delete individual directories =
in the filesystem, before destroying the actual filesystem.  You
> may run into a situation where you don't have enough RAM/ARC to =
destroy a deduped filesystem.
>=20
> --
> Freddie Cash
> fjwcash@gmail.com

>From what I've read so far, it looks like a "zfs send -R" would send the =
filesystem and all of the snapshots I've made. So would something like =
this work to move the duped filesystem and all of its snapshots over to =
a new undeduped filesystem: "zfs send -R backup/duped | zfs receive -duv =
backup/deduped" ?