From owner-freebsd-hackers@FreeBSD.ORG Sat May 30 19:12:15 2009 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id C09A31065674 for ; Sat, 30 May 2009 19:12:15 +0000 (UTC) (envelope-from mwm-keyword-freebsdhackers2.e313df@mired.org) Received: from mired.org (two.mired.org [74.143.213.43]) by mx1.freebsd.org (Postfix) with ESMTP id 6D4098FC0C for ; Sat, 30 May 2009 19:12:15 +0000 (UTC) (envelope-from mwm-keyword-freebsdhackers2.e313df@mired.org) Received: (qmail 38984 invoked by uid 1001); 30 May 2009 14:43:55 -0400 Received: from bhuda.mired.org (localhost.localdomain [127.0.0.1]) by bhuda (tmda-ofmipd) with ESMTP; Sat, 30 May 2009 14:43:54 -0400 Date: Sat, 30 May 2009 14:43:54 -0400 To: xorquewasp@googlemail.com Message-ID: <20090530144354.2255f722@bhuda.mired.org> In-Reply-To: <20090530175239.GA25604@logik.internal.network> References: <20090530175239.GA25604@logik.internal.network> Organization: Meyer Consulting X-Mailer: Claws Mail 3.7.1 (GTK+ 2.14.7; amd64-portbld-freebsd7.1) Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAAG1BMVEXguIzRkGnhyaz069mXhW0WHRnbrnR9WCQ6LB0CchNMAAACSUlEQVQ4jV2TQW7jMAxFGaPQOgQEdZaGMsgBrAvUA03dCxj1Uu4U2gfwQD7AGNax51NK07RcxXz6/CSl0Ij450vkPG1jzpIZM1UwDCl/xB14TWnNX8A00Qj5a0mnVFVbVUz4MeErea2HikSRqZzY894zwg9p2+/AtO8LzxFED+tNAUFeU29iFOLRxlZAcdo9A8wi8ZBMV4BKPde82Oxrvs6BTkulQIClte0DLFzzsKk9j1MBex8iUaP00Bd78S/muyFScrTXz6zLkEUxJp+SabQfNOs4f4Jpx5qSZ/304PWwlEWP1cOn/mJQR7EOD+uKhjcBLziuL7xoY5Xm+VFAUSw/LwwwsHEHxihpwV4EJH0xXRkbw1PkRw+X4pEuSJwBggqk+HEYKkiL5/74/nQkogigzQsAFrakxZyfw3wMIEEZPv4AWMfxwqE5GNxGaERjmH+PG8AE0L4/w9g0lsp1raLYAN5azQa+AOoO9NwcpFkTrG2VKNMNEL5UKUUAw34tha0z7onUG0oBoNtczE04GwFE3wCHc0ChezAJ6A1WMV81AtY7wDAJSlXwV+4cwBvsOsrQMRawfQEBz0deEZ7WNpV2szckIKo5VpDHDSDvF1GItwqqAlG01Hh50BGtVhuUkjkasg/14bYFGCgWg1fSWHvmOoJck2xdp9ZvZBHzDVTzX23TkrOn7qe5U2COEw5D4Vx3qEQpFY2Z/3QFnJxzp7YCmSMG19nOUoe869zZfOQb5ywQuWu0yCn5+8gxZz+BE7vG3j4/wbf4D/sXN9Wug1s7AAAAAElFTkSuQmCC Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Delivery-Agent: TMDA/1.1.12 (Macallan) From: Mike Meyer Cc: freebsd-hackers@freebsd.org Subject: Re: Request for opinions - gvinum or ccd? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 30 May 2009 19:12:16 -0000 On Sat, 30 May 2009 18:52:39 +0100 xorquewasp@googlemail.com wrote: > Simple question then as the handbook describes both ccd and gvinum - > which should I pick? My first reaction was "neither", then I realized - you didn't say what version of FreeBSD you're running. But if you're running a supported version of FreeBSD, that doesn't change my answer. If you're running 5.3 or later, you probably want gstripe. If you're running something older than that, then gvinum won't be available either, so you'll need to use ccd. I always figured gvinum was a transition tool to help move from vinum to geom, which is why it's managed to get to the 7.0 release with some pretty painful bugs in it, which don't show up in gstripe. The handbook clearly needs to be rewritten - ccd isn't supported anymore, except via the geom ccd class. However, I think zfs is going to change it all again, so such a rewrite wont' be useful for very long. I don't think zfs supports a two-disk stripe, thought it does do JBOD. If you're running a 7.X 64-bit system with a couple of GIG of ram, expect it to be in service for years without having to reformat the disks, and can afford another drive, I'd recommend going to raidz on a three-drive system. That will give you close to the size/performance of your RAID0 system, but let you lose a disk without losing data. The best you can do with zfs on two disks is a mirror, which means write throughput will suffer. http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O< ascii ribbon campaign - stop html mail - www.asciiribbon.org