From owner-freebsd-questions@FreeBSD.ORG Mon Apr 30 02:44:44 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 81C8616A400 for ; Mon, 30 Apr 2007 02:44:44 +0000 (UTC) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: from gizmo.acns.msu.edu (gizmo.acns.msu.edu [35.8.1.43]) by mx1.freebsd.org (Postfix) with ESMTP id 4F92D13C44C for ; Mon, 30 Apr 2007 02:44:44 +0000 (UTC) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: from gizmo.acns.msu.edu (localhost [127.0.0.1]) by gizmo.acns.msu.edu (8.13.6/8.13.6) with ESMTP id l3U2fxAA015144; Sun, 29 Apr 2007 22:41:59 -0400 (EDT) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: (from jerrymc@localhost) by gizmo.acns.msu.edu (8.13.6/8.13.6/Submit) id l3U2fwtT015143; Sun, 29 Apr 2007 22:41:59 -0400 (EDT) (envelope-from jerrymc) Date: Sun, 29 Apr 2007 22:41:58 -0400 From: Jerry McAllister To: Klaus Friis =?iso-8859-1?Q?=D8stergaard?= Message-ID: <20070430024158.GB15045@gizmo.acns.msu.edu> References: Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.4.2.2i Cc: freebsd-questions@freebsd.org Subject: Re: scsi raid geometry high-point rocketraid 1640 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Apr 2007 02:44:44 -0000 > Hi, > > I have a raidcontroller high-point 1640 with 4 disks of 400 GB in a raid 5 > array given me 1200 GB. The bios utility of the controller zero build the > array with 64 kb > > FDISK says that the geometry is 145923/255/63 and it is incorrect. Then it > says that for scsi it is the translation mode the raid controller is using. Usually you want to accept what fdisk does. Just make the slices that you want. Geometry is virtual on these systems. > > How do I find this? > > If I continue with the defaults I only get 1144654 MB like missing 100 GB. Well, I would expect you to get something less than 1,490 GB just from the difference between the manufacturer use of GB (1,000,000,000 Bytes) and the way the OS uses GB (1,073,741,824 Bytes). I don't know how much the raidcontroller eats up to manage the raid. Raid 5 takes a piece for its redundancy/error correction. A raid 5 would eat at least 20% and maybe up to 30% if it is rather inefficient. After that you will lose some because of inconvenient remnants of space that doesn't get used. Then, there are amounts for superblocks and other aspects of building a filesystem, etc. I think that tends to be around 10% altogether. So, your number seems somewhat probable, offhand, without detailed calculations. What operations did you do to get to that point? Mine would be an fdisk that makes one slice of the entire device, a bsdlabel that divides the slice in to about 6 partitions (including swap) and a newfs on each partition except swap. ////jerry > > -- > Klaus F. Østergaard, > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" >