From owner-freebsd-hackers@FreeBSD.ORG Fri Mar 27 03:38:37 2015 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 41A66C2B; Fri, 27 Mar 2015 03:38:37 +0000 (UTC) Received: from anubis.delphij.net (anubis.delphij.net [IPv6:2001:470:1:117::25]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "anubis.delphij.net", Issuer "StartCom Class 1 Primary Intermediate Server CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 2111E9E3; Fri, 27 Mar 2015 03:38:37 +0000 (UTC) Received: from Xins-MBP.home.us.delphij.net (c-71-202-112-39.hsd1.ca.comcast.net [71.202.112.39]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by anubis.delphij.net (Postfix) with ESMTPSA id DD841EBCB; Thu, 26 Mar 2015 20:38:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=delphij.net; s=anubis; t=1427427516; x=1427441916; bh=+d9p7mCRq+VZRQ+MtsZDx5ToWfBdgOx8jBSacGj5cK8=; h=Date:From:To:CC:Subject:References:In-Reply-To; b=JCrIE1BgKAIDxe/3qX0yvcT0VM/OF+9wuST6z4wyKESC4ik7NO8e5/z/Q6feBv2Fi FECz/2a1Y2y+SZPWh/5v0ZRdLBC8en1F+DwoXe5Bo9cinu+5g2udPqyGYxCEXJj7NG kvgyCnnX8QpBAyZtJWgTgRP2a7gMByoBIFYFLeSM= Message-ID: <5514D0A9.1040106@delphij.net> Date: Thu, 26 Mar 2015 20:38:17 -0700 From: Xin Li User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: Adrian Chadd , "O'Connor, Daniel" Subject: Re: Seagate Archive HDD References: <55148E42.80708@delphij.net> <4F65B315-5FFE-4184-91FD-C05A40E0A26E@dons.net.au> <5514A133.8060409@delphij.net> <88DE4F68-B05E-4E4D-8C4A-DED8147172E7@dons.net.au> In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Cc: "freebsd-hackers@freebsd.org" , Xin LI , Wojciech Puchar X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Mar 2015 03:38:37 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 3/26/15 17:58, Adrian Chadd wrote: > ... all the talk about this stuff, and yet noone's talked about > how ZFS is supposed to be append only, and boy wouldn't that be > awesome. :) It doesn't overwrite existing data with the assumption that a, let's say, 4K-native drive doesn't have a 1MB "band" when writing. I hope the "journal" would be helpful for this assuming it is on non-volatile medium... Cheers, -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJVFNCnAAoJEJW2GBstM+nsBQQQAIfR1JdSFYe+IsWDmnVDmKjy 35D0gsXKwNh37NTnvKiT2jzoM7BqwdJsQa6yWn+++ufzYkmMbcVHmlL52M8vk6ho UlJvkVONrYkZn2VVEZx01XulbX3hFq7DBCxTYspbBUdZcsZfiRQdMDPtsv+EW/ct nalBP3pHcHiK/CvgLVMELyQJZzMV1pb7gBaXSgRk7h0lyFhffIKwcD7qCt2cfV1W gbyYsQvC/envn9Yn5IDxOdddnyXihkDot/n/uX1kbUy5ZVfL+Wx1LidInwoc+/wY Jgh2zpXsNuwGTHodYj95unLhZnw177fy99n2w+7e8TuwPqZlLcqUxVvpnIn3d30e NyLeWW80yRjjVhWvl7zHQrWx2BCWuGHOvCExa3NuyXJWB5iJrn+izPUE6dXqkVzW YU1abrHNrMwJpLowm/Rjnlf9XWBdDhYUBIzibVXGhmdNKFcx7UslY3dWO4XckDdP hYmQVOAJrqK7cHNuzQCFrSKh4cVbo9t0gckD7lYJEk91BxAg+sBNt/iO9kR0AUvV 59BSBnremJAHNUQUDfJooWu2yKczGUASuhT20etKXPx/Y7qdhmA4i+McITwGZVJj tCIFUkysQocXY+XRX+6XkFd8j3MgzzkSzEvyqNdovczHACGRyVedNuyVmsGZ7ciL CUWJcAHv7ojKBXyDDlOa =e2je -----END PGP SIGNATURE-----