From owner-freebsd-current@FreeBSD.ORG Fri Jun 25 09:26:50 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A1D1816A4CE for ; Fri, 25 Jun 2004 09:26:50 +0000 (GMT) Received: from vhost109.his.com (vhost109.his.com [216.194.225.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id D889E43D68 for ; Fri, 25 Jun 2004 09:26:49 +0000 (GMT) (envelope-from brad.knowles@skynet.be) Received: from [10.0.1.3] (localhost.his.com [127.0.0.1]) by vhost109.his.com (8.12.11/8.12.3) with ESMTP id i5P9PdFs016762; Fri, 25 Jun 2004 05:25:41 -0400 (EDT) (envelope-from brad.knowles@skynet.be) Mime-Version: 1.0 X-Sender: bs663385@pop.skynet.be Message-Id: In-Reply-To: <20040625064913.GB33437@dragon.nuxi.com> References: <20040625064913.GB33437@dragon.nuxi.com> Date: Fri, 25 Jun 2004 10:26:52 +0200 To: freebsd-current@freebsd.org From: Brad Knowles Content-Type: text/plain; charset="iso-8859-1" ; format="flowed" Content-Transfer-Encoding: 8bit cc: 'FreeBSD Current' cc: Daniel Eriksson Subject: Re: Multiple choices for RAID-0, best performance? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Jun 2004 09:26:50 -0000 At 11:49 PM -0700 2004-06-24, David O'Brien wrote: > Why "maybe ccd"?? > It works fine. I've been using ccd(4) for the past 4 years for all my > FreeBSD development drive space. I said that (at the time) because I was not 100% certain of the implementation of ccd, and wasn't convinced that it was a true striping solution as opposed to a simple concatenation (which would get you the same disk storage space, but not the performance). I know that vinum used to be the best thing around for striping and mirroring (witness my page at , and the fairly highly rated USENET news peering server I built in the Joe Greco style), but I always had problems with the RAID-5 stuff, and I had problems with interactions between vinum and softupdates. More recently, vinum seems to have suffered from bitrot (well, it didn't keep up with all the other changes going on), and other people mentioned that they weren't using it anymore and had gone back to using ccd (especially Joe). I'm hoping that the new geom_vinum and geom_stripe stuff will give us a better and more robust solution than we previously had on the software side, and I'm hoping that Søren (and others) can continue to work on the hardware side through improvements to the ataraid drivers, etc.... But in the meanwhile, there's a lot of stuff that used to work, a lot of stuff that is under development, and it's not exactly clear to me just what is really stable and usable at this current point in time. -- Brad Knowles, "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin, Historical Review of Pennsylvania. SAGE member since 1995. See for more info.