From owner-freebsd-hackers@FreeBSD.ORG Wed Sep 3 04:10:26 2003 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5D75616A4BF; Wed, 3 Sep 2003 04:10:26 -0700 (PDT) Received: from chuggalug.clues.com (chuggalug.demon.co.uk [62.49.17.236]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1FF8F43FFB; Wed, 3 Sep 2003 04:10:25 -0700 (PDT) (envelope-from geoffb@chuggalug.clues.com) Received: from chuggalug.clues.com (localhost [127.0.0.1]) by chuggalug.clues.com (8.12.9/8.12.8) with ESMTP id h83B6GVp030367; Wed, 3 Sep 2003 11:06:16 GMT (envelope-from geoffb@chuggalug.clues.com) Received: (from geoffb@localhost) by chuggalug.clues.com (8.12.9/8.12.8/Submit) id h83B6Fag030366; Wed, 3 Sep 2003 11:06:15 GMT Date: Wed, 3 Sep 2003 11:06:15 +0000 From: Geoff Buckingham To: Max Clark Message-ID: <20030903110615.GA25233@chuggalug.clues.com> References: <20030902224136.GA98381@dan.emsphone.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.1i cc: freebsd-hackers@freebsd.org cc: freebsd-performance@freebsd.org cc: Dan Nelson cc: freebsd-questions@freebsd.org Subject: Re: 20TB Storage System X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Sep 2003 11:10:26 -0000 On Tue, Sep 02, 2003 at 03:53:53PM -0700, Max Clark wrote: > Depends on whether you plan on crashing or not :) According to > http://lists.freebsd.org/pipermail/freebsd-fs/2003-July/000181.html, > you may not want to create filesystems over 3TB if you want fsck to > succeed. I don't know if that's using the default newfs settings > (which would create an insane number of inodes), though. > > - This is a big problem (no pun intended), my smallest requirement is still > 5TB... what would you recommend? The smallest file on the storage will be > 500MB. > If you files are all going this large I imagine you should look carefully at what you do with inodes, block and cluster sizes However I just read the newfs man page and am intrigued to know what effect the -g and -h options have.... -g avgfilesize The expected average file size for the file system. -h avgfpdir The expected average number of files per directory on the file system.