From owner-freebsd-hackers@FreeBSD.ORG Fri Mar 27 00:58:14 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 64B30EA1 for ; Fri, 27 Mar 2015 00:58:14 +0000 (UTC) Received: from mail-wi0-x22e.google.com (mail-wi0-x22e.google.com [IPv6:2a00:1450:400c:c05::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id E9A2E779 for ; Fri, 27 Mar 2015 00:58:13 +0000 (UTC) Received: by wibbg6 with SMTP id bg6so9218306wib.0 for ; Thu, 26 Mar 2015 17:58:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=AGvmacpMetNYCf4cVrrH0zscEAhz9ASnC8nhrTQc+TA=; b=o1RuFwwdfXC7AmXvAYw9yOE+HgWxBWN7hnwgGc52nPa4nVOvu/PVNtLgYelDc16kPA +UEpAsYFZ8KbEPzwrV5OZdCGrLH4bYFuCdFqOjBkiuoljXUsPwpWWxlotKAVdAr3QWFe QZ44jVkYd7BytJPd5Z4jS67tyt7RBrLc/zg5iIabCMuHtqp3GFAUVsQX+fkmBhlsqesg HZlS/sZ+s2WIglXMtoQ3xmA5czb7mya3razTNEVG95LBpH2rosy79BxKL80RrBw8Kf4f SWjk0Y5HcTQiOmnR2JaQbc0hg8wJg8mfz7Jb67/VygKrTwS++fuvVJ3u9NQ6qaExhrrr cpfw== MIME-Version: 1.0 X-Received: by 10.194.48.12 with SMTP id h12mr34072632wjn.74.1427417892375; Thu, 26 Mar 2015 17:58:12 -0700 (PDT) Sender: adrian.chadd@gmail.com Received: by 10.180.40.14 with HTTP; Thu, 26 Mar 2015 17:58:12 -0700 (PDT) In-Reply-To: <88DE4F68-B05E-4E4D-8C4A-DED8147172E7@dons.net.au> 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> Date: Thu, 26 Mar 2015 17:58:12 -0700 X-Google-Sender-Auth: VWWYmYoWCIPLHFkfCYygEjUrMjs Message-ID: Subject: Re: Seagate Archive HDD From: Adrian Chadd To: "O'Connor, Daniel" Content-Type: text/plain; charset=UTF-8 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 00:58:14 -0000 ... 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. :) So - is anyone planning on working on the minimum set of stuff to expose the write topology for these shingled disks, so experiments can start being made? Even just knowing the shingle size(s) for writes would be enough to do useful amounts of work from userspace. -adrian