From owner-freebsd-questions@freebsd.org Wed May 11 17:34:50 2016 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E0573B37DCE for ; Wed, 11 May 2016 17:34:50 +0000 (UTC) (envelope-from byrnejb@harte-lyne.ca) Received: from inet08.hamilton.harte-lyne.ca (inet08.hamilton.harte-lyne.ca [216.185.71.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "inet08.hamilton.harte-lyne.ca", Issuer "CA HLL ISSUER 01" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id A7D331A39 for ; Wed, 11 May 2016 17:34:50 +0000 (UTC) (envelope-from byrnejb@harte-lyne.ca) Received: from localhost (localhost [127.0.0.1]) by inet08.hamilton.harte-lyne.ca (Postfix) with ESMTP id BA17F61257 for ; Wed, 11 May 2016 13:34:48 -0400 (EDT) X-Virus-Scanned: amavisd-new at harte-lyne.ca Received: from inet08.hamilton.harte-lyne.ca ([127.0.0.1]) by localhost (inet08.hamilton.harte-lyne.ca [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id snRRID8zxdzz for ; Wed, 11 May 2016 13:34:47 -0400 (EDT) Received: from webmail.harte-lyne.ca (inet04.hamilton.harte-lyne.ca [216.185.71.24]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by inet08.hamilton.harte-lyne.ca (Postfix) with ESMTPSA id 3EE5161250 for ; Wed, 11 May 2016 13:34:47 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=harte-lyne.ca; s=dkim_hll; t=1462988087; bh=oDaYGx9POUv3E/x+etS5efKbYFnEBddHMbwmyttBWoE=; h=Date:Subject:From:To:Reply-To; b=XYXy+IxfXewMD3JU3iMsnKUkr5T0Fhc2gdFoFPLdFOzjmeFdM8jGJoxcxQU4BfHns CngsJW7ldb0WJpQ66xhP7xwayhjoQLJkivw4hdVLmf68qGTdr0bLJ9EmA1QKCLUtca GI0oPI104KIEbf8N5lsDrOsz1ISgILVDuPT+5TfhCD674xiw1UFNC+zf0pHkpAtCSX R4sjJKSQ37IdnyWkf/nZLIJ4tpxuB0orUxEt8JQuAP/X55oh3MrwnbRytPbhq8G7lm vwgwWzZj0CWOTXjARTrn8Jq6TD8Mpo+nqrhjaLLpsROeSLljFFjAcIkoRnX1cnMlU9 EtQYz7d+g4WdQ== Received: from 216.185.71.44 (SquirrelMail authenticated user byrnejb) by webmail.harte-lyne.ca with HTTP; Wed, 11 May 2016 13:34:47 -0400 Message-ID: <0409d2208ccce8e2f9e0ce6526bf6756.squirrel@webmail.harte-lyne.ca> Date: Wed, 11 May 2016 13:34:47 -0400 Subject: FreeBSD-10.3 root ZFS From: "James B. Byrne" To: freebsd-questions@freebsd.org Reply-To: byrnejb@harte-lyne.ca User-Agent: SquirrelMail/1.4.22-4.el6 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 May 2016 17:34:51 -0000 We have eight (8) 3Tbyte drives on a system upon which I am installing FreeBSD. The quest arises of whether one should simply grab all of the disks or partition them to reserve a spare area. The reason put forth for partitioning is this statement in man zspool(8): zpool replace [-f] pool device [new_device] Replaces old_device with new_device. This is equivalent to attaching new_device, waiting for it to resilver, and then detaching old_device. The size of new_device must be greater than or equal to the minimum size of all the devices in a mirror or raidz configuration. One can conceive of a 3Tb drive which has slightly more or fewer accessible sectors than its nominal size. If the zspool incorporates a drive with fewer accessible sectors than average for its nominal size and one seeks to replace it with a similar drive that has more than average for the same nominal capacity then what is the result? Is the new drive accepted or rejected? -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Do NOT open attachments nor follow links sent by e-Mail James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3