From owner-freebsd-questions Thu Mar 20 4:16:51 2003 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 2B9AB37B401 for ; Thu, 20 Mar 2003 04:16:50 -0800 (PST) Received: from hauptpostamt.charite.de (hauptpostamt.charite.de [193.175.66.220]) by mx1.FreeBSD.org (Postfix) with ESMTP id 08BCF43FA3 for ; Thu, 20 Mar 2003 04:16:49 -0800 (PST) (envelope-from alexander.haderer@charite.de) Received: from localhost (localhost [127.0.0.1]) by hauptpostamt.charite.de (Postfix) with ESMTP id 4329315C00E; Thu, 20 Mar 2003 13:16:45 +0100 (CET) Received: from localhost ([127.0.0.1]) by localhost (hauptpostamt.charite.de [127.0.0.1:10025]) (amavisd-new) with SMTP id 26232-09; Thu, 20 Mar 2003 13:16:44 +0100 (CET) Received: from postamt1.charite.de (postamt1.charite.de [193.175.66.246]) by hauptpostamt.charite.de (Postfix) with ESMTP id 2CABB15C005; Thu, 20 Mar 2003 13:16:44 +0100 (CET) Received: from chaplin.charite.de (chaplin.str.charite.de [192.168.202.88]) by postamt1.charite.de (Postfix) with ESMTP id E4380633B4; Thu, 20 Mar 2003 13:16:43 +0100 (CET) Message-Id: <5.2.0.9.1.20030320125711.019eb9c8@postamt1.charite.de> X-Sender: afrika@postamt1.charite.de X-Mailer: QUALCOMM Windows Eudora Version 5.2.0.9 Date: Thu, 20 Mar 2003 13:13:18 +0100 To: Maarten de Vries , Dirk-Willem van Gulik From: Alexander Haderer Subject: Re: Three Terabyte Cc: freebsd-questions@FreeBSD.ORG In-Reply-To: <20030320125035.Y84859@manhattan.unsavoury.net> References: <20030320111436.N74106-100000@foem.leiden.webweaving.org> <20030320111436.N74106-100000@foem.leiden.webweaving.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Virus-Scanned: by amavisd-new Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG At 12:53 20.03.2003 +0100, Maarten de Vries wrote: >On Thu, 20 Mar 2003, Dirk-Willem van Gulik wrote: > > > Depends on what access patterns you have; is it mostly dormant > > archiving; or lots of access, concurrent, sequential ? How safe does the > > data need to be; and against what (hardware failure, accidental rm -rf). > >This would be for backup. Data on about 50 webservers would be backed up >to it on a nightly basis. So performance wouldn't be important. Sure? Consider this: a. Filling 3TB with 1 Mbyte/s lasts more than 800 hours or 33 days. b. Using ssh + dump/cpio/tar needs CPU power for encryption, especially when multiple clients safe their data at the same time. c. When using FreeBSD 4.X a fsck after a hard reboot will block the server. fsck'ing a full 3TB filesystem may need a long time. Its better to use several smaller file systems. d. Wrong parameters for newfs may slowdown large filesystems and waste lots of space. Before using large filesystems read the manpage of newfs, especially the topics about options -b -f -i with best regards, Alexander -- Alexander Haderer Charite Berlin - Germany To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message