From owner-freebsd-stable@FreeBSD.ORG Sun Jan 2 11:33:51 2011 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 E0696106564A for ; Sun, 2 Jan 2011 11:33:51 +0000 (UTC) (envelope-from dan@langille.org) Received: from nyi.unixathome.org (nyi.unixathome.org [64.147.113.42]) by mx1.freebsd.org (Postfix) with ESMTP id AB8EF8FC1E for ; Sun, 2 Jan 2011 11:33:51 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by nyi.unixathome.org (Postfix) with ESMTP id DE24B508AC; Sun, 2 Jan 2011 11:33:50 +0000 (GMT) X-Virus-Scanned: amavisd-new at unixathome.org Received: from nyi.unixathome.org ([127.0.0.1]) by localhost (nyi.unixathome.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pb+2-r9WgD0Y; Sun, 2 Jan 2011 11:33:50 +0000 (GMT) Received: from smtp-auth.unixathome.org (smtp-auth.unixathome.org [10.4.7.7]) (Authenticated sender: hidden) by nyi.unixathome.org (Postfix) with ESMTPSA id 94BBA50850 ; Sun, 2 Jan 2011 11:33:50 +0000 (GMT) Message-ID: <4D20629D.2030803@langille.org> Date: Sun, 02 Jan 2011 06:33:49 -0500 From: Dan Langille Organization: The FreeBSD Diary User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7 MIME-Version: 1.0 To: Jeremy Chadwick References: <4D1AF388.3080107@infracaninophile.co.uk> <4D1B7431.7070808@infracaninophile.co.uk> <4D1BD8D0.5010402@langille.org> <4D1C4A2D.4020206@infracaninophile.co.uk> <4D1C7929.3040809@langille.org> <20101231233343.GB48579@server.vk2pj.dyndns.org> <20101231234747.GA8171@icarus.home.lan> In-Reply-To: <20101231234747.GA8171@icarus.home.lan> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org, Peter Jeremy Subject: Re: slow ZFS on FreeBSD 8.1 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: Sun, 02 Jan 2011 11:33:52 -0000 On 12/31/2010 6:47 PM, Jeremy Chadwick wrote: > On Sat, Jan 01, 2011 at 10:33:43AM +1100, Peter Jeremy wrote: >> Based on my experiences at home, I converted my desktop at work to >> pure ZFS. The only issues I've run into have been programs that >> extensively use mmap(2) - which is a known issue with ZFS. > > Is your ZFS root filesystem associated with a pool that's mirrored or > using raidzX? What about mismatched /boot content (ZFS vs. UFS)? What > about booting into single-user mode? > > http://wiki.freebsd.org/ZFSOnRoot indirectly hints at these problems but > doesn't outright admit them (yet should), so I'm curious to know how > people have solved them. Remembering manual "one-offs" for a system > configured this way is not acceptable (read: highly prone to > error/mistake). Is it worth the risk? Most administrators don't have > the tolerance for stuff like that in the middle of a system upgrade or > what not; they should be able to follow exactly what's in the handbook, > to a tee. > > There's a link to www.dan.me.uk at the bottom of the above Wiki page > that outlines "the madness" that's required to configure the setup, all > of which has to be done by hand. I don't know many administrators who > are going to tolerate this when deploying numerous machines, especially > when compounded by the complexities mentioned above. This basically outlines the reason why I do not use ZFS on root. -- Dan Langille - http://langille.org/