From owner-freebsd-questions@FreeBSD.ORG Wed Jan 26 12:17:49 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8B778106566C for ; Wed, 26 Jan 2011 12:17:49 +0000 (UTC) (envelope-from kraduk@gmail.com) Received: from mail-ww0-f42.google.com (mail-ww0-f42.google.com [74.125.82.42]) by mx1.freebsd.org (Postfix) with ESMTP id 1CFB68FC21 for ; Wed, 26 Jan 2011 12:17:48 +0000 (UTC) Received: by wwi17 with SMTP id 17so5130923wwi.1 for ; Wed, 26 Jan 2011 04:17:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=JL+K116oIQd9UWg/nF5PcFL3sTS9+QuggXfs3znmSh0=; b=NvzzTx6d2CV+jICFMErz+7UvY9id+IxX+zQ2atqJ4+gQr+h4+lyJT0nSDRWcUxe4m5 w3xdiQIqf4GKBmNuNG0Z/yYr2o7QoI4Hc+2V9nCNa9UdOPkqJ+7MBtwrC4zuXZjswkWG GUky6c2og+eQkH95vqnjDatuFrf98djTjFzgc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=J+U5g4vfH31NvPKdabFs+zMlTNZwRzSmMCs7KJDEHb7oSujLNeDnrhdfagIq0AIAHE zoC6P+gX0PoFPlEx1X9OsLJp370iIvumBulhsMQtnHSAgYO5cbTLCKmy8flb5552s0L2 mc3UCHNX/LxptTd621GosUcYVxcdfNP8uNXdA= MIME-Version: 1.0 Received: by 10.216.208.230 with SMTP id q80mr4767306weo.103.1296044267798; Wed, 26 Jan 2011 04:17:47 -0800 (PST) Received: by 10.217.0.8 with HTTP; Wed, 26 Jan 2011 04:17:47 -0800 (PST) In-Reply-To: References: <4D3FDE82.4000105@mail.zedat.fu-berlin.de> Date: Wed, 26 Jan 2011 12:17:47 +0000 Message-ID: From: krad To: Christer Solskogen Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: "O. Hartmann" , freebsd-questions@freebsd.org Subject: Re: FreeBSD 9/ZFS: Striped Pool (2 disks) migrating to mirror (onto additional disk) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jan 2011 12:17:49 -0000 On 26 January 2011 09:21, Christer Solskogen wrote: > On Wed, Jan 26, 2011 at 9:42 AM, O. Hartmann > 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, > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.o= rg" > ive not tried it but wouldn't you want to gstripe the two disks together and then add the geom device to the pool? It sounds a bit horrible to me and with the price of 2TB disks being ~ =A365-70 here in the uk I wouldn't bother. Remember you will get a speed boost for reads on a mirror. WIth regards to the backup, the most efficient way would probably to use zfs send and receive between the pools