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From: Christer Solskogen <christer.solskogen@gmail.com>
Date: Wed, 26 Jan 2011 10:21:33 +0100
Message-ID: <AANLkTi=udjU-MKEU+AHU2DyyLL3sMVcKbT3WsLGW7YTN@mail.gmail.com>
To: "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>
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Cc: freebsd-questions@freebsd.org
Subject: Re: FreeBSD 9/ZFS: Striped Pool (2 disks) migrating to mirror (onto
 additional disk)
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On Wed, Jan 26, 2011 at 9:42 AM, O. Hartmann
<ohartman@mail.zedat.fu-berlin.de> wrote:

> My question is: is it possible to migrate the two-disk pool without data
> loss into a mirrored pool by adding the one 2TB-disk?
>

No, you cant create a two-way mirror of three disks with ZFS. The only
way of doing what you want by creating a gmirror (or by hardware raid)
of the two 1TB disks.

-- 
chs,