From owner-freebsd-fs@FreeBSD.ORG  Mon Aug 27 22:08:39 2012
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Date: Mon, 27 Aug 2012 18:08:33 -0400
From: Glen Barber <gjb@FreeBSD.org>
To: antonin tessier <antonintessier@live.fr>
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Cc: freebsd-fs@freebsd.org
Subject: Re: ZFS compression doesn't work
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On Mon, Aug 27, 2012 at 11:51:06PM +0200, antonin tessier wrote:
>=20
> Hello,
>=20
>=20
> I am trying to understand and use ZFS features. My issue is that
> compression doesn't work, indeed I have a pool and a filesystem
> named "home" and "home/compressed".
> #zfs list
>=20
>  NAME               USED  AVAIL  REFER  MOUNTPOINT
>  home                       7.33G            180G   32K     home
>  home/compressed  7.33G   180G  7.33G  /home/compressed
>=20
> despite I did:
> # zfs set compression=3Dgzip home/compressed
>=20
> I don't understand where it is wrong.
>=20

Did you set this at time the pool was created?  If you set this after
the pool already contained data, existing data is not compressed.

Glen


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