From owner-freebsd-fs Thu Nov 21 8:56: 5 2002 Delivered-To: freebsd-fs@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0E7E737B401 for ; Thu, 21 Nov 2002 08:56:04 -0800 (PST) Received: from digitas.harvard.edu (digitas.eecs.harvard.edu [140.247.60.248]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6AFF743E6E for ; Thu, 21 Nov 2002 08:56:03 -0800 (PST) (envelope-from jecarrol@digitas.harvard.edu) Received: from digitas.harvard.edu (localhost [127.0.0.1]) by digitas.harvard.edu (8.12.6/8.12.6) with ESMTP id gALGtspp011359 for ; Thu, 21 Nov 2002 11:55:54 -0500 (EST) (envelope-from jecarrol@digitas.harvard.edu) Received: from localhost (jecarrol@localhost) by digitas.harvard.edu (8.12.6/8.12.6/Submit) with ESMTP id gALGtsXC011356 for ; Thu, 21 Nov 2002 11:55:54 -0500 (EST) (envelope-from jecarrol@digitas.harvard.edu) Date: Thu, 21 Nov 2002 11:55:54 -0500 (EST) From: Jason Carroll To: freebsd-fs@freebsd.org Subject: Maximum filesystem size Message-ID: <20021121110057.U11066-100000@digitas.harvard.edu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Hi everyone-- Paul Anderson posed this question on the list several months ago, but I didn't see an answer to it. I'm interested in creating a filesystem larger than the 1 terabyte "soft limit" indicated in the FreeBSD FAQ (question 3.29). The FAQ claims: "For ffs filesystems, the maximum theoretical limit is 8 terabytes (2G blocks), or 16TB for the default block size of 8K. In practice, there is a soft limit of 1 terabyte, but with modifications filesystems with 4 terabytes are possible (and exist)." Anyone have any experience with this or know what modifications this might entail? I'd also like to hear anyone's thoughts on what kind of problems (performance or more serious) might be created with such a large filesystem. In more detail, I'm trying to create a 2TB filesystem on an external SCSI disk array. I believe SCSI has a 2TB limit which I'm trying to get as close as possible to. Thanks, Jason Carroll To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message