From owner-freebsd-stable@FreeBSD.ORG Thu Apr 21 23:07:43 2005 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C37E416A4CE for ; Thu, 21 Apr 2005 23:07:43 +0000 (GMT) Received: from gromit.dlib.vt.edu (gromit.dlib.vt.edu [128.173.49.29]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4049B43D48 for ; Thu, 21 Apr 2005 23:07:43 +0000 (GMT) (envelope-from paul@gromit.dlib.vt.edu) Received: from zappa.Chelsea-Ct.Org (pool-70-110-10-69.roa.east.verizon.net [70.110.10.69]) by gromit.dlib.vt.edu (8.13.3/8.13.3) with ESMTP id j3LN7e0Y095150 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 21 Apr 2005 19:07:42 -0400 (EDT) (envelope-from paul@gromit.dlib.vt.edu) Received: from zappa.Chelsea-Ct.Org (localhost.Chelsea-Ct.Org [127.0.0.1]) by zappa.Chelsea-Ct.Org (8.13.3/8.13.3) with ESMTP id j3LN7Z03044694 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 21 Apr 2005 19:07:35 -0400 (EDT) (envelope-from paul@gromit.dlib.vt.edu) Received: (from paul@localhost) by zappa.Chelsea-Ct.Org (8.13.3/8.13.3/Submit) id j3LN7Zh5044693; Thu, 21 Apr 2005 19:07:35 -0400 (EDT) (envelope-from paul@gromit.dlib.vt.edu) X-Authentication-Warning: zappa.Chelsea-Ct.Org: paul set sender to paul@gromit.dlib.vt.edu using -f From: Paul Mather To: Claus Guttesen In-Reply-To: <1114123141.43365.122.camel@zappa.Chelsea-Ct.Org> References: <1114123141.43365.122.camel@zappa.Chelsea-Ct.Org> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Thu, 21 Apr 2005 19:07:34 -0400 Message-Id: <1114124854.43365.137.camel@zappa.Chelsea-Ct.Org> Mime-Version: 1.0 X-Mailer: Evolution 2.2.2 FreeBSD GNOME Team Port cc: freebsd-stable@freebsd.org Subject: Re: vinum or gvinum on FreeBSD 5.4 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Apr 2005 23:07:43 -0000 > On Thu, 2005-04-21 at 10:39 +0200, Claus Guttesen wrote: > > Hi. > > > > I may implement (g)vinum to stripe two 2 TB raid 5 volumes into a > > single 4 TB vinum-volume. The volumes reside on a atabeast doing the > > raid 5. The server is a 5.4 RC2 doing nfs on i386. > > > > According to some threads gvinum may not be completely stable (in 5.3, > > http://unix.derkeiler.com/Mailing-Lists/FreeBSD/current/2004-11/0537.html) > > when doing raid 5 but works fine when striping. > > > > Should I go vinum or gvinum? Will newfs have problems with a 4 TB > > volume? Are there any performance-degradation doing striping? I forgot to mention, but you should consult http://www.freebsd.org/projects/bigdisk/ to get an idea of the current state of play and issues regarding large disk handling in FreeBSD. According to the table of userland tools, it should be okay to newfs a file system > 2 TB, but you might not be able to fsck or dump/restore it. :-( Also, I think that page holds for -CURRENT, and may not apply to 5.x. But, Pawel Jakub Dawidek has worked on large disk support, and so there's a good chance that his geom_stripe feature is able to handle > 2 TB sizes. You could test it via gstripe on large swap-backed md providers. I also dimly recall you may run into problems running out of RAM trying to fsck very large filesystems. Cheers, Paul. -- e-mail: paul@gromit.dlib.vt.edu "Without music to decorate it, time is just a bunch of boring production deadlines or dates by which bills must be paid." --- Frank Vincent Zappa