From owner-freebsd-stable@FreeBSD.ORG Wed Sep 2 07:44:50 2009 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 6FCCF1065670 for ; Wed, 2 Sep 2009 07:44:50 +0000 (UTC) (envelope-from emikulic@gmail.com) Received: from ipmail03.adl6.internode.on.net (ipmail03.adl6.internode.on.net [203.16.214.141]) by mx1.freebsd.org (Postfix) with ESMTP id EDBF78FC19 for ; Wed, 2 Sep 2009 07:44:49 +0000 (UTC) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApsEAAO9nUqWZZrw/2dsb2JhbACReLcFkgWEGwU X-IronPort-AV: E=Sophos;i="4.44,316,1249223400"; d="scan'208";a="28872209" Received: from ppp154-240.static.internode.on.net ([150.101.154.240]) by ipmail03.adl6.internode.on.net with ESMTP; 02 Sep 2009 17:14:46 +0930 Received: by ppp154-240.static.internode.on.net (Poo-fix, from userid 1001) id 78CD05C6E; Wed, 2 Sep 2009 17:44:45 +1000 (EST) Date: Wed, 2 Sep 2009 17:44:45 +1000 From: Emil Mikulic To: Mark Stapper Message-ID: <20090902074445.GA13588@dmr.ath.cx> References: <061541E3-F301-46C4-8ECB-5B05854F0EAA@exscape.org> <4A9D558A.9070609@quip.cz> <4A9E1CB5.6030906@mapper.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4A9E1CB5.6030906@mapper.nl> User-Agent: Mutt/1.5.20 (2009-06-14) Cc: Maciej Jan Broniarz , freebsd-stable@freebsd.org, Miroslav Lachman <000.fbsd@quip.cz>, Thomas Backman Subject: Re: zfs on gmirror slice X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Sep 2009 07:44:50 -0000 On Wed, Sep 02, 2009 at 09:20:21AM +0200, Mark Stapper wrote: > updating a zfs filesystem which you are running from is next to > impossible. [citation needed] :) > So, i would recommend setting up gmirror to mirror your whole disks, > install the base system(boot and "world") on a small UFS slice, and use > the rest of the disc as zfs slice. As Thomas Backman pointed out, this means you won't get self-healing. I don't know if a ZFS mirror performs smarter disk access scheduling than gmirror. Someone oughta measure. ;) I recommend you (Maciej) do what Freddie Cash said: slice your disks into two pieces each - a gmirror'd UFS root, and the rest for ZFS. (or work out how to zfsboot) --Emil