From owner-freebsd-questions@FreeBSD.ORG Mon Mar 22 18:13:46 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 9E34B106566B for ; Mon, 22 Mar 2010 18:13:46 +0000 (UTC) (envelope-from dan.naumov@gmail.com) Received: from mail-bw0-f216.google.com (mail-bw0-f216.google.com [209.85.218.216]) by mx1.freebsd.org (Postfix) with ESMTP id 318A98FC20 for ; Mon, 22 Mar 2010 18:13:45 +0000 (UTC) Received: by bwz8 with SMTP id 8so431283bwz.3 for ; Mon, 22 Mar 2010 11:13:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type; bh=NbYqbqyko04DidvWfcIkAwhQhtb6RoiOBBRFV+iPJPM=; b=o9I5QnvsQRBN3XTfEh5McmCs3MIPVwUlOrO/CNzp0rj/MQr3GSbqO3t5t/iBlnMuRu V3F5qGFhl7xy1bptBGYFimVzL1KQAfCqTuJEijsI/9viJYo4To4sMF5zuDMH+WHkj5IM I4tPB6Z1RbkP6sWHqhzkWfk125EeKXMsdKp5Q= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=rn1y28P5/3R8IwNannAEqhA5B1VBhkYBieCklRneYy9atyrdMpHoIlQD8Ety9lrYiS kbPF8BLoLxOmuMhIIqy0y8hd5hFQUhIlDeyJrGmcdhwWf4d+4yJDA2NK9ygiduk2FvyY G/xmZF9Kumf47MxJ3KADiKMWQQpLiSgdjHwr8= MIME-Version: 1.0 Received: by 10.204.39.198 with SMTP id h6mr4358245bke.182.1269281624533; Mon, 22 Mar 2010 11:13:44 -0700 (PDT) Date: Mon, 22 Mar 2010 20:13:44 +0200 Message-ID: From: Dan Naumov To: freebsd-questions@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 Subject: RE: 12 TB Disk In freebsd AMD 64 ? 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, 22 Mar 2010 18:13:46 -0000 MBR can only work with 2TB volumes, however, we are no longer limited to MBR. With GPT, we can have really really big volumes. That being said, I really don't think you should be using a single 12TB volume with UFS, even if you have underlying redundancy provided by a hardware raid device. Have you ever had to fsck a 2TB volume or bigger? It's not fun. My recommendation would be to use ZFS. Use it to manage your array and filesystems and use it on top of individual raw disk devices, if you must use your raid controller, use it in JBOD mode. If you want a relatively technical introduction to ZFS and why it's good for you, read up here: http://www.slideshare.net/relling/zfs-tutorial-usenix-june-2009 - Sincerely, Dan Naumov