From owner-freebsd-hackers@FreeBSD.ORG Thu Mar 26 22:37:19 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 990D8640; Thu, 26 Mar 2015 22:37:19 +0000 (UTC) Received: from mail-oi0-x22c.google.com (mail-oi0-x22c.google.com [IPv6:2607:f8b0:4003:c06::22c]) (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 5A07D5EE; Thu, 26 Mar 2015 22:37:19 +0000 (UTC) Received: by oiag65 with SMTP id g65so62092411oia.2; Thu, 26 Mar 2015 15:37:18 -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=qfVoZWlVsDjfJceGKykSEUjSBENvkfsbafH4o3jTOfE=; b=gu3s7Cg4i6rdXerlPqHktCcLr7d5pK9imrNd6kz0FxN6jv71rRN3KAC2EhtCYBMOIg FBUAfukAd4rQBbLwa+SzIe2lQMeaAP4Pz/l1nEVaShGA27B9E0b/Z7T1lch5SUQDGuxA 2uYogPQk/158kSmZpvWwLkbPnBSQiK27rq1kVi3XjPfp2+rkknsdmfpj4HvDo8hMzWPd 9LklWFJSBSihxjZEm1z2nxZii7muXcnFtbFCtfk+4hZyUm0oak1TiYDpH1zasPYPhR9r FwUwp3zw0jRj53RLpTiAeqJx/aEkDzOIU7EGqlVqalkp0OjyH8ZKhDkPnkkUEm/qHdRG J9iA== MIME-Version: 1.0 X-Received: by 10.202.187.5 with SMTP id l5mr143944oif.51.1427409438288; Thu, 26 Mar 2015 15:37:18 -0700 (PDT) Sender: asomers@gmail.com Received: by 10.202.215.7 with HTTP; Thu, 26 Mar 2015 15:37:18 -0700 (PDT) In-Reply-To: References: Date: Thu, 26 Mar 2015 16:37:18 -0600 X-Google-Sender-Auth: 1EgO2QCGU0jwDhv5eDpcE1HIlhk Message-ID: Subject: Re: Seagate Archive HDD From: Alan Somers To: Adrian Chadd Content-Type: text/plain; charset=UTF-8 Cc: "freebsd-hackers@freebsd.org" , 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: Thu, 26 Mar 2015 22:37:19 -0000 On Thu, Mar 26, 2015 at 4:33 PM, Adrian Chadd wrote: > Hm, what's required to get the stripe size for doing IO or whatever > the under-the-hood thing is for the Sharding? > > -a My understanding is that it's impossible; the drive-managed SMR drives present themselves as ordinary disks. But, if their design is similar to the upcoming host-aware SMR drives, then the band size will be on the order of a few hundred megabytes. -Alan