From owner-freebsd-current@FreeBSD.ORG  Fri May 11 18:13:06 2007
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
X-Original-To: freebsd-current@freebsd.org
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 1067016A406
	for <freebsd-current@freebsd.org>; Fri, 11 May 2007 18:13:06 +0000 (UTC)
	(envelope-from efinley@efinley.com)
Received: from postmaster.etv.net (postmaster.etv.net [66.111.113.15])
	by mx1.freebsd.org (Postfix) with ESMTP id EACC013C489
	for <freebsd-current@freebsd.org>; Fri, 11 May 2007 18:13:05 +0000 (UTC)
	(envelope-from efinley@efinley.com)
Received: from efinley04.etv.net ([74.214.237.51] helo=science3.efinley.com)
	by postmaster.etv.net with smtp (Exim 4.67 (FreeBSD))
	(envelope-from <efinley@efinley.com>)
	id 1HmZ7C-000AVf-9U; Fri, 11 May 2007 11:41:14 -0600
From: Elliot Finley <efinley@efinley.com>
To: Ivan Voras <ivoras@fer.hr>
Date: Fri, 11 May 2007 11:41:13 -0600
Message-ID: <qja94352hc2o9r15b7fnmvlfk86ums6m4o@4ax.com>
References: <cbi6431a042bfp601o08c5pp7abbqmpm54@4ax.com>
	<f2057n$uhn$1@sea.gmane.org>
In-Reply-To: <f2057n$uhn$1@sea.gmane.org>
X-Mailer: Forte Agent 4.1/32.1088
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: quoted-printable
X-Mailman-Approved-At: Fri, 11 May 2007 18:43:33 +0000
Cc: freebsd-current@freebsd.org
Subject: Re: ZFS the perfect FS?  if only...
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 11 May 2007 18:13:06 -0000

On Fri, 11 May 2007 00:09:52 +0200, you wrote:

>Elliot Finley wrote:
>> If you could start with a 3 drive zraid2 as the underlying pool
>> storage and later add drives to the existing zraid2 as space was
>> needed, then ZFS would be the ultimate FS (at least for me).
>>=20
>> Any takers?  How hard would this be?
>
>Isn't zraid2 like RAID6, e.g. includes 2 "parity" components? How do you
>propose to redistribute the parity blocks after a disk is included in
>already functioning RAID5 or RAID6 volume?
>
>(hint: http://en.wikipedia.org/wiki/RAID5#RAID_5)

The new 3Ware cards do Online Capacity expansion.  So it's obviously
not impossible.