From owner-freebsd-fs@FreeBSD.ORG Wed Feb 8 19:26:34 2012 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D4550106564A for ; Wed, 8 Feb 2012 19:26:34 +0000 (UTC) (envelope-from bfriesen@simple.dallas.tx.us) Received: from blade.simplesystems.org (blade.simplesystems.org [65.66.246.74]) by mx1.freebsd.org (Postfix) with ESMTP id 84DE78FC0A for ; Wed, 8 Feb 2012 19:26:34 +0000 (UTC) Received: from freddy.simplesystems.org (freddy.simplesystems.org [65.66.246.65]) by blade.simplesystems.org (8.14.4+Sun/8.14.4) with ESMTP id q18JQXmY023154; Wed, 8 Feb 2012 13:26:33 -0600 (CST) Date: Wed, 8 Feb 2012 13:26:33 -0600 (CST) From: Bob Friesenhahn X-X-Sender: bfriesen@freddy.simplesystems.org To: Tom Vier In-Reply-To: <20120208184728.GH6814@zero> Message-ID: References: <20120208184728.GH6814@zero> User-Agent: Alpine 2.01 (GSO 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.2 (blade.simplesystems.org [65.66.246.90]); Wed, 08 Feb 2012 13:26:33 -0600 (CST) Cc: freebsd-fs@freebsd.org Subject: Re: zfs checksums on non-raidz X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 08 Feb 2012 19:26:34 -0000 On Wed, 8 Feb 2012, Tom Vier wrote: > In mirror and single dev zpools, are data and metadata still checksummed, or > only when using raidz? Checksums are done at the decoded/reassembled filesystem block level (e.g. 128K) so they are performed regardless of the underlying storage topology or compression used. Checksums are still in effect even if there is no data redundancy. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/