From owner-freebsd-questions@FreeBSD.ORG Thu Apr 3 03:19:33 2003 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EA09A37B492 for ; Thu, 3 Apr 2003 03:19:32 -0800 (PST) Received: from dire.bris.ac.uk (dire.bris.ac.uk [137.222.10.60]) by mx1.FreeBSD.org (Postfix) with ESMTP id CAB6C43F85 for ; Thu, 3 Apr 2003 03:19:31 -0800 (PST) (envelope-from Jan.Grant@bristol.ac.uk) Received: from mail.ilrt.bris.ac.uk by dire.bris.ac.uk with SMTP-PRIV with ESMTP; Thu, 3 Apr 2003 12:19:25 +0100 Received: from cmjg (helo=localhost) by mail.ilrt.bris.ac.uk with local-esmtp (Exim 3.16 #1) id 1912j6-0003ui-00; Thu, 03 Apr 2003 12:17:48 +0100 Date: Thu, 3 Apr 2003 12:17:48 +0100 (BST) From: Jan Grant X-X-Sender: cmjg@mail.ilrt.bris.ac.uk To: Heinrich Rebehn In-Reply-To: <3E8C12C8.5050503@ant.uni-bremen.de> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: Jan Grant cc: questions@freebsd.org Subject: Re: newfs parameters for a 500 GB volume ? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Apr 2003 11:19:34 -0000 On Thu, 3 Apr 2003, Heinrich Rebehn wrote: > Jan Grant wrote: > > >On Thu, 3 Apr 2003, Heinrich Rebehn wrote: > > > > > > > >>Thank you for your reply. I have reread the manpage and would go for: > >>- blocksize => 64 kB > >>- fragsize => 64/8 => 8 kB > >>- bytes/inode => 16 kB > >> > >>Are these values reasonable or should i use higher values (because the > >>disk is so large?) > >> > >> > > > >I'd turn bytes per inode up to 200k or so - there's a paragraph in "man > >7 tuning" on this. > > > >If the application is critical then benchmarking "real use" as closely > >as possible will enable you to find optimal sizes for stripes, and is > >probably time well spent. > > > > > > > > > Oh, i had forgotten the tuning(7) manpage. Neiter newfs nore tunefs > contain a refrence to it! > Having read it, i am not so sure about the blocksize any more.I > t says that going higher that 16K can make the fs slower. Does this > still hold true? As far as that's concerned, your best bet would be to benchmark the application you're intending on using and see how it behaves. -- jan grant, ILRT, University of Bristol. http://www.ilrt.bris.ac.uk/ Tel +44(0)117 9287088 Fax +44 (0)117 9287112 http://ioctl.org/jan/ It's a sad fact that the word "semantics" seems to have lost all meaning.