From owner-freebsd-questions@FreeBSD.ORG Wed Oct 22 00:15:29 2008 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 017AE1065670 for ; Wed, 22 Oct 2008 00:15:29 +0000 (UTC) (envelope-from k0802647@telus.net) Received: from outbound03.telus.net (outbound03.telus.net [199.185.220.222]) by mx1.freebsd.org (Postfix) with ESMTP id A56F58FC08 for ; Wed, 22 Oct 2008 00:15:28 +0000 (UTC) (envelope-from k0802647@telus.net) Received: from priv-edtnaa07.telusplanet.net ([75.157.26.132]) by priv-edtnes29.telusplanet.net (InterMail vM.7.08.02.02 201-2186-121-104-20070414) with ESMTP id <20081022001457.UPGI29980.priv-edtnes29.telusplanet.net@priv-edtnaa07.telusplanet.net>; Tue, 21 Oct 2008 18:14:57 -0600 Received: from oliver.bc.lan (d75-157-26-132.bchsia.telus.net [75.157.26.132]) by priv-edtnaa07.telusplanet.net (BorderWare Security Platform) with ESMTP id 0D472B333C1F05DE; Tue, 21 Oct 2008 18:15:26 -0600 (MDT) Received: from [10.111.111.112] (unknown [10.111.111.112]) by oliver.bc.lan (Postfix) with ESMTP id E8090646B; Tue, 21 Oct 2008 17:15:25 -0700 (PDT) Message-ID: <48FE709D.9080907@telus.net> Date: Tue, 21 Oct 2008 17:15:25 -0700 From: Carl User-Agent: Thunderbird 2.0.0.16 (Windows/20080708) MIME-Version: 1.0 To: freebsd-questions@freebsd.org, wojtek@wojtek.tensor.gdynia.pl Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Subject: re: Setting up gmirror 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, 22 Oct 2008 00:15:29 -0000 Wojciech Puchar wrote: > Andrew Falanga wrote: >> Identical drive models so their sizes are the same. Is this the >> command, from gmirror(8), the one I'll want to use? >> >> Create a mirror on disk with valid data (note that the last sector of the >> disk will be overwritten). Add another disk to this mirror, so it will >> be synchronized with existing disk: >> >> gmirror label -v -b round-robin data da0 > > add -s like -s 1048576 to prevent splitting one request > on 2 disks. I thought the -s option was only applicable when using "-b split" for the balancing algorithm. Does "round-robin" not mean simply alternating between the two disks without ever splitting requests? What are the considerations in choosing between "load", "prefer", "round-robin", and "split" balance algorithms? Carl / K0802647